RNA is like a cousin of DNA. They're both made up of tiny building blocks called nucleotides, but RNA is usually just one strand while DNA has two. Also, RNA has a different letter (base) called uracil instead of thymine. RNA does lots of different jobs in cells, like making proteins and controlling how genes work.

Even though DNA is usually thought of as the boss when it comes to genetic information, RNA is also really important. Some scientists think that RNA might have even been the first genetic material in the very first living things!

The fact that living things use both RNA and DNA to store and pass on their genetic information is one piece of evidence that all living things are related and came from a common ancestor a long time ago.
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