The menu bar in Mac is where you can quickly access various functions on your machine. From connecting to various WiFi networks to checking out how much power is left on your battery, you can do that all right from the menu bar on your Mac.
The great thing about it is it can be accessed regardless of what application you are currently using. It does not distract your current work and lets you get your task done.
Various applications have come into existence that have been designed to sit in the menu bar and let you perform various tasks. Just one click on these apps’ icons and you will be able to get the thing done.