Ubuntu for Android is like having a big invisible helper inside your phone or tablet. This helper, also known as an operating system, is called Ubuntu. You can't see it, but it helps your phone do all the things you want it to do like make phone calls, send text messages, take pictures and play games.
Ubuntu for Android is special because it is designed to work with both Android and Ubuntu at the same time. This means that you can use Ubuntu's features on your Android phone or tablet without needing a separate computer. Ubuntu has many cool features just like Android does. It can run full desktop office software, play music and even edit photos.
So, if you have Ubuntu for Android installed on your phone, you can use your phone just like you always do, but now you can also use it like a real computer. If you plug your phone into a monitor, keyboard and mouse, you can use it like a regular computer that runs Ubuntu.
This is really helpful for people who need to have access to their work or personal files on the go - like if they are traveling or don't have a separate computer. With Ubuntu for Android, you can have all the power of a computer right at your fingertips.