Some things are more likely than others.

In July, rain in Bangladesh is very likely. In January, rain is unlikely. Chance words tell us how likely things are.
A chance line goes from impossible to certain. Even chance is in the middle, like a coin toss. Likely is near certain; unlikely is near impossible.
Red covers most of this spinner. Landing on red is likely. Landing on yellow is unlikely, but possible.
A fair spinner has equal parts. Each colour has the same chance. Is a dice fair? Why?
Predict first: red will happen more, blue might happen. Spin 20 times and tally. Compare the results with your prediction. Were you right?