Instruction level parallelism is when a computer can do more than one thing at the same time, like when you can play with blocks and color a picture at the same time.
In a computer, there are many tiny tasks called "instructions" that need to be done in order to complete a big task, like solving a math problem. The computer can sometimes do these tiny tasks at the same time, which makes it faster and more efficient.
Imagine you have two friends helping you build a big tower out of blocks. You could each work on different parts of the tower at the same time, so that it gets built faster. This is kind of like instruction level parallelism in a computer.
But sometimes, the instructions can't be done at the same time because they depend on each other. For example, if you need to add numbers together, you can't do it until you know what the numbers are. In a computer, if one instruction needs to wait for another one to finish before it can be done, then they can't be done at the same time.
Overall, instruction level parallelism is like having many little helpers in a computer, who work together to get things done faster and more efficiently, as long as they can do their tasks at the same time.