Okay, so imagine you have a toy box with lots of different toys in it. Now let's say you have a friend who really loves playing with toys, but they don't have any of their own. They ask you if they can come over and play with your toys.
A list broker is kind of like someone who helps people find toy boxes filled with specific types of toys.
Instead of toy boxes, they're helping businesses find lists of people that fit certain criteria, like age, location, or interests.
The businesses need these lists so they can reach out to people and try to sell them things or promote their services.
The list broker is like a middleman, helping the businesses find the right toy box of people to market to, so they don't have to spend all their time searching for new customers.