Meaning of “tab” - Learner’s Dictionary

tab

noun [ C ] uk us /tæb/
PAPER/METAL ETC

a small piece of paper, metal, etc that is fixed to something and that you use to open it or find out information about it:

Pull tab to open.
AMOUNT OF MONEY

an amount of money that you owe for something you have bought or for a service you have used:

Officials said the tab for the new bridge would be $8 million.
INTERNET

a small symbol on a website that gives you information about the different pages you can open on that website:

Move between pages by clicking on the tabs at the top of the screen.
COMPUTING (also tab stop)

a fixed position on a line of text that you are writing on a computer, etc that can be reached by pressing the tab key

pick up the tab

to pay for something, especially a meal in a restaurant

(Definition of “tab” from the Cambridge Learner’s Dictionary © Cambridge University Press)