Arm big.little is like having two types of helpers to do a job. You have some big helpers who are strong and can do the hard work, but they need a lot of energy to keep going. Then you have some little helpers who are not as strong, but they don't need as much energy to work.
In the same way, arm big.little is a technology where a computer chip has two kinds of processors to do tasks. One part of the chip has big processors that are very powerful and can handle complicated tasks like playing games or editing videos, but they need a lot of energy to work.
The other part of the chip has little processors that are not as strong, but they don't need as much energy to work. They are good for simpler tasks like checking emails or browsing the internet.
So, when you are doing something that needs a lot of power, like playing a game or editing a video, the big processors will take over and do the job. But when you are doing something simple, like checking emails or browsing the internet, the little processors will do the work and save energy.
Overall, arm big.little helps your device save energy while still being able to handle different kinds of tasks. It's like having two types of helpers who can work together to get the job done efficiently.