The Advanced Audio Distribution Profile, or A2DP, is a subset of profiles with which a device must be compatible with in order to use Bluetooth ® technology.
This technology enables audio to be transmitted from an A2DP component, which can include a phone or a computer to another. The components are classified exclusively to a source (a phone or computer) and a receiver (a set of Bluetooth headphones or stereo system). These devices usually support AVCRP so you change skip through songs or allow your headsets to initiate cellphone cameras.
However A2DP support is not available on all Bluetooth® 2.0 devices. Nor is A2DP exclusive to Bluetooth® 2.0 devices, which is also not true.
If you have a phone or computer, it probably has A2DP Bluetooth support... it's 2017.