So, you know how there are different levels of football/soccer, right? Like how there are big teams like Barcelona and Real Madrid, and then smaller teams that are still really good, but maybe not AS famous? The Eerste Divisie is a league in the Netherlands where those smaller teams play.
Basically, it's like a stepping stone for teams that want to eventually make it to the top league (called the Eredivisie). So, the Eerste Divisie is kind of like a training ground for those teams to get better and learn how to play against other really good teams.
So, each year, a bunch of teams from all over the Netherlands play each other in the Eerste Divisie. They play a bunch of games, and whoever wins the most games gets to go up to the Eredivisie for the next season. And then, some of the worst teams in Eredivisie go back down to Eerste Divisie to start all over again.
It's kind of like a big game of soccer musical chairs - the teams are always moving up and down between the two leagues depending on how well they play. But no matter what league they're in, the teams are still really good and work really hard to score goals and win games.