What is the difference between et cetera and et al?

et cetera and et al, both are used to say "and others" or "and the rest of them". But the difference lies in the context one uses them.

et cetera: Used when things are the point of discussion

e.g.: The child's room was filled with cookies, chocolates etc.

et al: Used when people or individuals are the point of dicussion

e.g.: The pop concert was of MJ et al.