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.
It is not a worthy investment in current scenario because already number of coins are fluctuating in market and this project is gradually moving to negative way so no one is looking to this investment. Many potential platforms are available in the market so we should discuss in promising project it is really useful to many investors.