Why do viruses mutate?

Viruses are like tiny shape-shifters that change their clothes when they copy themselves.

Imagine you have a favorite shirt, and every time you wear it to school, you make a copy of it by drawing it on a piece of paper. But sometimes the copy isn’t perfect, maybe the sleeves are shorter or the buttons are in the wrong place. That's what happens with viruses: when they copy themselves, small mistakes can happen.

Why do these mistakes matter?

Viruses play hide and seek with your body. If your immune system already knows what the virus looks like, it can catch it easily. But if the virus changes its look, maybe by making a new shirt, it’s harder to find.

Sometimes these small mistakes make the virus stronger or faster, so it can spread more easily. That's why we get new flu strains every year, the virus is just trying on different outfits!

So, viruses mutate because they’re always copying themselves, and sometimes the copies aren’t perfect, but that helps them stay one step ahead of us!