You find them in newspapers and on the telly.
an adverisement / an ad
You have to pay it after a meal in a restaurant.
a bill
You need it to drive a car.
a driving licence
How is this symbol called? #
hashtag
What is this device?
a printer
You put a letter in it before you send it by post
an envelope
What's this?
software
www.youtube.com is an example of it.
a website
You write about your life in it.
a diary