Differentiation and Meaning of Account Type "Tax" at Chart of Account

Hi,
Can I know what’s the purpose of Account Type - Tax at Chart of Account. In most system that I explore before, it normally have Payables, receivables, bank and so on, but I’m wondering the function of Account Type - Tax at Chart of Account.

In order to set the account head for GST / VAT, is it necessary to Have GL Code under this type or not ?

Where do you find this?

Re Tax in my COA case I find this: