What is even parity bit and odd parity bit of binary number 1011?

Oh, dude, so like, in binary, a parity bit is just a way to check if the number of ones in a set of bits is even or odd. In this case, for the binary number 1011, the even parity bit would be 0 because there are already an odd number of ones, and the odd parity bit would be 1 because, well, it's odd. So, yeah, that's the deal with parity bits.