Tezos is still under development and coins can be bought at few exchanges.
From what I see it ethereum's competitor and new platform for smart contracts and dap's. It is still under testing, but developers are very active and it can become big project.
Disclamer - i don't hold any tezos.
I don't think it is a good idea to buy TEzos which had no value in market cap and circulating supply on CMC, until now maybe the intellectual right issue had not been solved that makes their coin in a pre-launch status.