Google Lighthouse is like a computer doctor that checks how healthy a website is. It looks at things like how fast the website loads, if it is easy to navigate, if it is safe to use, and if it can be used on different devices (like a phone or a tablet).
Just like when you go to the doctor, Google Lighthouse gives the website a check-up to see if there are any problems that need to be fixed. It also gives the website owner advice on how to make the website even better.
This is really important because a healthy website is easier to use and visit. When things are easy, we are happy! Plus, a website that is easy to use gets more visitors, which makes the website owner happy too!