What is the difference between a letter and a mail?.

A letter can be mail. A large package can also be mail. A letter or a package usually both come in the mail. The mail man/woman usually puts both into your mailbox unless the package won't fit. Then they either bring it to your door or leave a paper in your mailbox telling you to come pick up the package at your Post Office

the verbs are different

Explanation:

this theme is harry potter a fictional story there are movies and books about this in the beginning of this adventure.