Handwritten biometric recognition is when technology uses the way you write to identify who you are.
Imagine you are drawing a picture with different colored crayons. Each person has their own unique way of holding the crayon and using it to make shapes and lines. Just like how each person has their own unique handwriting when they write words on a piece of paper.
Handwritten biometric recognition uses computer programs to analyze how you write, looking at things like the pressure you use, the speed you write at, and the shape of your letters. The computer then takes these unique features and uses them to identify you as the person who wrote a particular message.
This technology can be used to help keep information secure by making sure only authorized people can access it. For example, if you need to log in to your bank account, the computer could use your handwriting as a way to confirm that it's really you trying to access your account.
So, it's like when you sign your name on a birthday card or a check, only instead of just being a way to show who wrote it, it can also be used to confirm your identity!