Daily Challenges, as the name suggests, are daily objectives that you can achieve for a  variety of rewards. The more challenges you complete, the more rewards you can get. And the best part? They renew every day!

The goal is to complete challenges to earn rewards. For each Challenge completed you also get points, which can be used to unlock Challenge Bags! 
You can check how many points you need to unlock a Challenge Bag by checking the progression bar at the Challenge screen.
Every day you will have 4 new Challenges available, and they must be completed in 24 hours. If you don’t complete them within the time-limit they will reset on the following day.

Once you fill up the progression bar you unlock a reward bag!