According to Wikipedia:
A maximal clique is a clique that is not included in a larger clique.
and
A maximum clique is a clique that includes the largest possible number of vertices.
According to Wikipedia:
A maximal clique is a clique that is not included in a larger clique.
and
A maximum clique is a clique that includes the largest possible number of vertices.
If it has the largest possible number of vertices, a larger clique can't exist, so ...