Okay, so imagine you have a friend named Emily. You and Emily make a promise to always be best friends forever and ever. That's a covenant.
Now, let's say one day Emily moves away to a faraway place and you don't see her as much anymore. You still want to be friends, but it's hard to keep that promise when you're not together all the time.
That's kind of like what happened in the Bible. God made a covenant with the people of Israel, promising to always be with them and take care of them. But over time, things got complicated and people broke the covenant by doing bad things and not following God's rules.
So, God decided to make a new covenant. This time, instead of being a promise between just God and the people of Israel, it was a promise between God and all people. This new covenant was made through Jesus, who taught people to be kind and love one another.
Basically, the new covenant is like a promise that we'll always try to be good and follow Jesus' teachings. It's a way for God to say that even though we mess up sometimes, He still loves us and wants to be in a relationship with us.