Which work of Charles Dickens’s is most known to be autobiographical?

The most autobiographical work of Charles Dickens is thought to be David Copperfield, a novel which was first published in 1850. In this novel many events and elements of Dickens’s life follow.
The original title of this novel is :
The Personal History, Adventures, Experience and Observation of David Copperfield the Younger of Blunderstone Rookery (which he never meant to publish on any account)
It’s a story of life of its main character David Copperfield from childhood to maturity