What is the difference between possibility and probability?

What is the difference between possibility and probability?

Possibility is when there is a chance that something may happen or be true while probability is the likelihood of something happening or being true:

Example:
"Until yesterday, the project was just apossibility, but now it has become a real probability."

It is likely that it will happen.

Expressing Possibility

My grandmother may travel alone.

May be she will make the trip alone.

Perhaps she will visit London.

Possibly, she will go by plane.

It's possible that someone will meet her at the airport.

She might buy some presents for the family before she goes.

I suppose she might spend a lot of money on the presents.

There's a chance she'll like the city.

She will take an umbrella as it couldrain heavily there..

Expressing impossibility

No, it's impossible to repair that old Chevrolet.

Even a good mechanic can't possiblyfix it.

We may not be able to travel by car.

There's no chance my father repairs it tomorrow.