Green bar showing days left, what does it mean?

I am new to Monzo bank. I would to know the meaning of a green bar on top of the app showing number of days left. It gets me mad as I think ‘days for what?’

It’s Monzos prediction of how much money you’ll have leftover before you get paid next.

This takes into account your budgets and direct debits for example.

Help on features and how to use Monzo can be accessed from the ‘help’ section in the app. Here is the help article for the ‘left to spend’ bar (green bar)