Tax Category

Dear Gurus,

Could you please let me know the meaning of Tax category? How it is different from Tax types(ex: Input tax, Output tax)

What is customer tax category and material tax category? Can u provide some examples of tax categories?

What is tax classification ? difference between tax category and tax classification?

As i am unable to find its definition and meaning in wiki.

Relation between Tax category and Tax procedure?

What is configuring tax per document? (Read the wiki but didn't understand)

Regards,

Sridhar.