So, the Senate Intelligence Committee is a group of very smart people who work for the government and they spent a long time looking at something called the CIA torture program. The CIA is another group of people who work for the government, and they were using some really mean and scary techniques to get information from people they thought were bad guys.
Now, these techniques, like waterboarding (which is like pouring water over someone's face so they can't breathe properly), sleep deprivation (which means not letting someone sleep for a long time), and forcing people to stay in really uncomfortable positions or cages for a long time, are things that are really not very nice or fair. It's not like playing a game or something fun, it's actually hurting someone and making it really hard for them to feel comfortable or safe.
The Senate Intelligence Committee decided to write a report on this because they wanted to make sure that people knew what was going on and that it wasn't okay. They looked at lots of documents and talked to lots of people to figure out what happened and why.
The report showed that the people who were being tortured didn't actually give the CIA any useful information, and that the program wasn't very effective in helping to stop terrorism. It also showed that the CIA lied to Congress and the public about what they were doing and how many people they were doing it to.
So, in the end, the report was really important because it helped people understand what was happening and why it wasn't okay. It made it clear that even if we are fighting against people we think are bad, we can't torture them or be mean to them because it's not fair or right. We have to treat everyone with respect and try to find better ways to keep ourselves safe.