Necropolitics is a big word that means when powerful people or groups use their power to decide who lives and who dies. It's really not fair because some people have more power than others and can make these decisions without thinking about the consequences for other people's lives.
Think about it like a game of "Simon Says." The person who is "Simon" gets to tell everyone else what to do and if they don't follow, they're out of the game. In necropolitics, the powerful people get to be "Simon" and they get to decide who stays in the game (or stays alive) and who has to leave (or die). It's not a fair game because some people have more power than others, and they get to make the rules that benefit them.
We can see examples of necropolitics in different areas. In war, powerful countries may decide to bomb and attack weaker countries, and innocent people who have nothing to do with the conflict can get hurt or killed. In healthcare, rich people may have access to better treatments or hospitals, while poor people may not have access to the same care and treatments. In politics, some politicians may pass laws or policies that benefit themselves or their friends, while others suffer because of those decisions.
Overall, necropolitics is when some people use their power to control other people's lives, and it's not fair because everyone deserves to have a fair chance at life.