you could have used google to find the official website and read the details faster
yes you can call it an altcoin but ethereum is more of a platform rather than being a coin. it had a nice idea but the platform and the project is not good enough in my opinion. there are other very similar projects that do things better and with less bugs. such as Lisk.
and not it has nothing to do with bitcoin, they try to attach themselves to bitcoin whenever it suits them to advertise their project and pump it as we saw last week. and ethereum is centralized and most of the supply is controlled by the whales. these are the only things you need to know about it.
but go the the website and see the code for more information if you are interested in the platform and the pump and dumps.