-rRNA is the ribosomal RNA. It forms a ribosome complex with proteins. It works like an enzyme to put the amino acids that are carried by the tRNA together to make proteins.
Essential, the rRNA forms the ribosome which reads the information on the mRNA. Then, it takes amino acids that are carried by tRNA and put the amino acids together to make a protein.
1) the mRNA carries info
2) the tRNA holds the amino acids
3) the mRNA is copied from DNA and it has a similar structure, a long strand. It is like a script that is read off.
4) the rRNA is globular - it is like an enzyme - and reads the code to put amino acids together.
5) the tRNA is coiled with an anticodon sequence. The anticodon binds to the codon of the mRNA so that the correct tRNA with the correct amino acid will be added to the protein chain.
Textbooks and websites often do a better job at describing RNA translation than you can find here since they will have nice colorful pictures to go with them. You should check those out to get a better idea of the process.