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This question already has an answer here:

In Brazil airspace, we do not have VORTACs to navigate (unfortunately). That's why my doubts about accuracy, the range, the possible systems/frequencies they operate, and if there is any restriction to use it to navigate.

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marked as duplicate by Simon, FreeMan, fooot, SMS von der Tann, Federico Jul 6 '16 at 14:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ Just to be clear: you're asking the differences between a VOR and a VORTAC (that is, a type of beacon that's both a VOR/DME and a TACAN), or you're asking about the differences between VORs (or VOR/DME) and TACANs in terms of range, accuracy, etc.? $\endgroup$ – Marco Sanfilippo Jul 6 '16 at 12:39
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VOR stands for VHF Omnidirectional Range. It is a navigation beacon intended for civil use and provides a user with a radial to/from the station. It works on frequencies between 108.00 and 117.95 MHz.

VOR/DME station PEK (Beijing):

enter image description here source: Wikimedia, author: Yaoleilei

TACAN stands for TACtical Air Navigation, a military system that is similar to VOR but with higher accuracy. It works on frequencies between 960 and 1215 MHz.
Part of the TACAN is DME (Distance Measurement Equipment), which works in the same frequency band. The DME used in TACAN is the same that can be used by civil aircraft. Due to the higher frequency the system is more accurate and the antenna is much smaller and therefor easier to deploy (e.g. on a ship, on a battlefield).

A view from the ground of a Tactical Air Navigation System (TACAN) antenna (source: wikimedia, US Air Force, Camera Operator: SENIOR AIRMAN JONNA N. WILSON)

A VORTAC combines the VOR and TACAN in one location. Civil users will use the VOR signals which have the same performance as ordinary VOR signals. In addition they use the DME from the TACAN. Effectively a VORTAC is like a VOR/DME. Military users only use the TACAN, for them a VORTAC is the same as a TACAN.

VORTAC TGO (TANGO, Germany) near Aichtal and Neckartailfingen, Germany. VOR, short for VHF Omni-directional Range, is a type of radio navigation system for aircraft. This system is a combination of a VOR-DME and a TACAN source:Wikimedia, author: Hans-Peter Scholz Ulenspiegel

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