What are the 3 types of RNA in science?

There are many types of RNA however I believe your wanting the 3 that assist in cell reproduction and protein synthesis.

Messenger RNA (mRNA) carries the code for protein in it's structure, this mRNA strand goes to ribosomes to be translated into it's corresponding protein.

Transfer RNA (tRNA) Has an anti-codon, a group of 3 complementary bases which refer to a specific amino acid. This binds to the mRNA strand at the ribosome during protein synthesis to make the polypeptide chain

Ribsomal RNA (rRNA) is the component of ribosomes that is made from RNA often referred to as the catalytic component.