Dependent Events:

If one event affects the probability of another, they are called dependent

Example:

Real-life example: commit a robbery and go to jail. The simplest model in probability theory is getting a ball out of the basket.

Task example

You have a basket with 4 blue balls and 6 yellow balls. What is the probability of taking the yellow ball if we take a blue ball firstly?

If we take the blue ball first, it will affect the initial amount of balls and the relationship between blue and yellow balls. So, the two events depend on each other.