There are 3 types of RNA:
mRNA (Messenger RNA): This RNA is in charge to travel the genetic information from the nucleous to the ribosome, where it binds to it and give the genetic instructions for protein synthesis.
tRNA (Transfer RNA): This RNA is in charge of providing the correct amino acid to the ribosome during protein translation.
rRNA (Ribosomal RNA): This RNA are structural proteins of the ribosomes.