Okay, so sometimes when people feel upset or things aren't going their way, they might complain and try to get others to listen and help them fix the problem. This is called having a grievance. When politicians use this strategy to gain support from people who share their grievances, it is called grievance politics.
For example, let's say that a group of people feel like they are being treated unfairly because they are not getting the same opportunities as other people. They might feel upset and angry about this, and they might want someone to help them fix the problem. A politician who wants to gain their support might talk about how unfair it is and promise to help them if they are elected.
Grievance politics can be very powerful because it taps into people's emotions and makes them feel like they have someone on their side who understands their struggles. However, it can also be polarizing and create division between groups of people who have different grievances.
So, in summary, grievance politics is when politicians use people's grievances to gain support and influence political decisions.