Solid-phase synthesis is a method used to create complex molecules by attaching them to a solid support. This technique allows for the sequential addition of building blocks, which are chemically linked to the solid phase. As each new component is added, the reaction occurs on the solid surface, making it easier to purify the final product by washing away unreacted materials. This approach is widely used in the field of peptide synthesis and the development of small molecules. By using solid supports, chemists can efficiently produce a variety of compounds while minimizing the need for extensive purification steps.