Memory-level parallelism involves having multiple pieces of data in memory that can be processed at the same time by the same processor. This idea is used in computers to make them run faster. By having the processor access multiple pieces of data at the same time, it can complete tasks faster than it could if it only could access one piece of data at a time. Think of it like having multiple lanes of traffic on a highway. Instead of one lane with cars going about 10 miles per hour, you have multiple lanes with cars that can go much faster because they have more space.