What are the types of hollow concrete blocks?

Hollow concrete blocks come in several types, primarily including standard hollow blocks, which are used for general construction, and lightweight blocks, which offer improved insulation and reduced weight. Other variations include insulated concrete forms (ICFs) that provide thermal resistance, and architectural blocks, designed for aesthetic appeal. Additionally, there are lintel blocks used for supporting structures above openings and corner blocks that help in creating a stable corner in wall construction. Each type serves specific purposes based on structural and design needs.