Satire is a type of literature in which the author highlights the abuses and vices of a particular institution, corporation, individual or society at large. The purpose of satire is often to ridicule these in order to motivate social change.
Burlesque, on the other hand, is a type or artistic work that intends to cause humour to an audience by caricaturing serious subjects, or by painting these subjects as ridiculous. Its main purpose is to mock.