What is the difference between W2 and W4 forms?

[charlie]

I’m confused about the difference between W2 and W4 forms. I recently started a new job and had to fill out a W4, but at the end of the year, I received a W2. Can someone clearly explain the difference between W2 and W4, what each form is used for, and how they affect my tax withholding and tax return? I want to make sure I’m filing correctly and not missing anything important.