A beta sheet is a common structural motif in proteins, characterized by strands of amino acids that are linked together by hydrogen bonds. These strands can run parallel or antiparallel to each other, forming a sheet-like structure. Beta sheets contribute to the overall stability and shape of proteins, playing a crucial role in their function. In the context of protein structure, beta sheets are part of the larger framework known as secondary structure, which also includes alpha helices. Both motifs are essential for the proper folding and functionality of proteins, influencing how they interact with other molecules in biological processes.