Pressure is force that you produce when you press hard on something.

The pressure in a place or container is the force produced by the quantity of gas or liquid in that place or container.

If there is pressure on a person, someone is trying to persuade or force them to do something.

If you are experiencing pressure, you feel that you must do a lot of tasks or make a lot of decisions in very little time, or that people expect a lot from you.

If you pressure someone to do something, you try forcefully to persuade them to do it.