The primary function of the ribosome within a cell is to synthesize proteins. Ribosomes are complex molecular machines composed of ribosomal RNA (rRNA) and proteins, and they facilitate the translation of messenger RNA (mRNA) into amino acid sequences. This process is essential for gene expression and cellular function, as proteins carry out numerous roles in the organism, including structural, enzymatic, and regulatory functions. Ribosomes can be found free in the cytoplasm or attached to the endoplasmic reticulum, contributing to the overall efficiency of protein synthesis.