Ribosomal RNA (rRNA) is a type of RNA that plays a crucial role in the formation of ribosomes, the cellular structures responsible for protein synthesis. It serves as a structural component of ribosomes, helping to organize the ribosomal proteins and facilitating the translation of messenger RNA (mRNA) into proteins. In eukaryotic cells, rRNA is produced in the nucleolus and combines with proteins to form the large and small subunits of ribosomes. These subunits then assemble in the cytoplasm, where they interact with mRNA and transfer RNA (tRNA) to synthesize proteins, essential for various cellular functions.