Yes, it's normally 88 keys, but it most certainly isn't 8 octaves, as some have said, it's 7 and a quarter.
A cottage piano (as we call them in the UK) will have less, but it's only the most difficult works that use the outer extremities of the piano, and if you can manage those, you'll need a good piano. And that will have 88 keys.
As long as it has at least 70, you'll be fine.
Most keyboards, though, either have a full-sized piano keyboard or they have only 61 keys (same as a Church organ). 61 keys can be a little restrictive.