Meet two wiggly worms.
This is onezie:
10000000....000
And this is pointzie
.00000...00001

The question is: who is longer.

If onezie is the number of events
And pointzie is the probability something happens, then

If onezie is much bigger, our something is very likely.
If pointzie is much bigger, our something is very unlikely.
If onezie and pointzie are roughly the same size, we are not sure.