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2 Grammar and clarification
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What is an ATC clearance? Does a VFR flight have to get a ATC clearance?

1) Do all flightflights have to get an ATC clearance to fly in controlled airspace such as class C airspace? I know that IFR and VFR flights are provided with ATC service in class C airspace, but I am not sure that receiving ATC service means an ATC clearance must be obtained. And if so, should VFR aircraft also get an ATC clearance like an IFR clearance that is given to a pilot before take-off including clearane limit, route, level, squwak, etc?

2) What is an ATC clearance? 'ICAO Annex 11' defines an ATC clearance as an "Authorization for an aircraft to proceed under conditions specified by an air traffic control unit." And, also states that an "ATC clearance shall indicate a) aircraft identification as shown in the flight plan, b) clearance limit, c) route of flight, d) level(s) of flight for the entire route or part thereof and changes of levels if required and e)any any necessary instructions or information on other matters such as approach or departure manoeuvres, communications and the time of expiry of the clearance."

I think it meansrefers to the IFR clearance given to pilot before take-off.

Does it mean that an ATC clearance always include theseincludes all these items such as route or level? If the ATCO instructinstructs a VFR pilot to maintain 5,000ft for separation with IFR, is it just instruction because it doesn't include a clearance limit and route?

In the same vein, is a take-off clearance onea type of ATC clearance? It doesn't include some items such as route. But the definition of an ATC clearance states that "The abbreviated term “clearance” may be prefixed by the words “taxi,” “take-off,” “departure,” “en route,” “approach” or “landing” to indicate the particular portion of flight to which the air traffic control clearance relates."

What is ATC clearance? Does VFR have to get ATC clearance?

1) Do all flight have to get ATC clearance to fly controlled airspace such as class C airspace? I know that IFR and VFR flights are provided with ATC service in class C airspace, but I am not sure that receiving ATC service means ATC clearance must be obtained. And if so, should VFR aircraft also get ATC clearance like IFR clearance that is given to pilot before take-off including clearane limit, route, level, squwak, etc?

2) What is ATC clearance? 'ICAO Annex 11' defines ATC clearance as "Authorization for an aircraft to proceed under conditions specified by an air traffic control unit." And, also states that "ATC clearance shall indicate a) aircraft identification as shown in the flight plan, b) clearance limit, c) route of flight, d) level(s) of flight for the entire route or part thereof and changes of levels if required and e)any necessary instructions or information on other matters such as approach or departure manoeuvres, communications and the time of expiry of the clearance."

I think it means the IFR clearance given to pilot before take-off.

Does it mean that ATC clearance always include these all items such as route or level? If ATCO instruct VFR pilot to maintain 5,000ft for separation with IFR, is it just instruction because it doesn't include clearance limit and route?

In the same vein, is take-off clearance one of ATC clearance? It doesn't include some items such as route. But the definition of ATC clearance states that "The abbreviated term “clearance” may be prefixed by the words “taxi,” “take-off,” “departure,” “en route,” “approach” or “landing” to indicate the particular portion of flight to which the air traffic control clearance relates."

What is an ATC clearance? Does a VFR flight have to get a ATC clearance?

1) Do all flights have to get an ATC clearance to fly in controlled airspace such as class C airspace? I know that IFR and VFR flights are provided with ATC service in class C airspace, but I am not sure that receiving ATC service means an ATC clearance must be obtained. And if so, should VFR aircraft also get an ATC clearance like an IFR clearance that is given to a pilot before take-off including clearane limit, route, level, squwak, etc?

2) What is an ATC clearance? 'ICAO Annex 11' defines an ATC clearance as an "Authorization for an aircraft to proceed under conditions specified by an air traffic control unit." And, also states that an "ATC clearance shall indicate a) aircraft identification as shown in the flight plan, b) clearance limit, c) route of flight, d) level(s) of flight for the entire route or part thereof and changes of levels if required and e) any necessary instructions or information on other matters such as approach or departure manoeuvres, communications and the time of expiry of the clearance."

I think it refers to the IFR clearance given to pilot before take-off.

Does it mean that an ATC clearance always includes all these items such as route or level? If the ATCO instructs a VFR pilot to maintain 5,000ft for separation with IFR, is it just instruction because it doesn't include a clearance limit and route?

In the same vein, is a take-off clearance a type of ATC clearance? It doesn't include some items such as route. But the definition of an ATC clearance states that "The abbreviated term “clearance” may be prefixed by the words “taxi,” “take-off,” “departure,” “en route,” “approach” or “landing” to indicate the particular portion of flight to which the air traffic control clearance relates."

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What is ATC clearance? Does VFR have to get ATC clearance?

1) Do all flight have to get ATC clearance to fly controlled airspace such as class C airspace? I know that IFR and VFR flights are provided with ATC service in class C airspace, but I am not sure that receiving ATC service means ATC clearance must be obtained. And if so, should VFR aircraft also get ATC clearance like IFR clearance that is given to pilot before take-off including clearane limit, route, level, squwak, etc?

2) What is ATC clearance? 'ICAO Annex 11' defines ATC clearance as "Authorization for an aircraft to proceed under conditions specified by an air traffic control unit." And, also states that "ATC clearance shall indicate a) aircraft identification as shown in the flight plan, b) clearance limit, c) route of flight, d) level(s) of flight for the entire route or part thereof and changes of levels if required and e)any necessary instructions or information on other matters such as approach or departure manoeuvres, communications and the time of expiry of the clearance."

I think it means the IFR clearance given to pilot before take-off.

Does it mean that ATC clearance always include these all items such as route or level? If ATCO instruct VFR pilot to maintain 5,000ft for separation with IFR, is it just instruction because it doesn't include clearance limit and route?

In the same vein, is take-off clearance one of ATC clearance? It doesn't include some items such as route. But the definition of ATC clearance states that "The abbreviated term “clearance” may be prefixed by the words “taxi,” “take-off,” “departure,” “en route,” “approach” or “landing” to indicate the particular portion of flight to which the air traffic control clearance relates."