Who is Bob Cratchitt is the story a christmas carol? please explain

Bob Cratchit is Scrooge's overworked employee, a timid man afraid to stand up to his boss's demanding ways. The patriarch of a family poor in wealth but rich in love, he cares especially dearly for his crippled son, Tiny Tim. Cratchit is a symbol for the Victorian poor, good-hearted and hard-working but unable to climb out the stifling conditions of poverty.