To simplify that, DNA is composed mainly of four different “building blocks”, known mostly by their initials – so essentially DNA is a string of the letters GCAT. RNA is almost the same as DNA, except its building blocks are GCAU instead. The actual chemistry and structure of RNA is also slightly different. Edit: also yes, if you think of DNA and visualize the standard spiral, you can see that DNA is like a ladder with two sides. RNA is one spiral instead of the double that DNA has.
Functionally, you can think of DNA as the blueprint (genes) and RNA as the person who can read a blueprint and work with the construction team — RNA is essentially a messenger that carries instructions.
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