We denote Map$(X,Y)$ (unbased) mapping spaces from $X$ to $Y$.

If $X$ and $Y$ are finite CW complexes, $map(X,Y)$ is a CW complex?

Can we know the cell structure of Map$(X,Y)$?

For example, what is the cell structure of Map$(S^n,S^k)$ for $n \geq k$?

Please recommend related papers and textbooks.