What are alloys?

What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.

An alloy is a homogeneous mixture of two or more metals or non-metals. It is prepared by blending the metals (and/ or non-metal) in molten state.
An important alloy containing lanthanoid metals (95%), iron (5%), traces of S, C, Ca and Al are misch metal.
Misch metal is used in Mg based alloy to produce bullets, shell and lighter flint.