Sealing and bonding are two distinct processes used in concrete construction and maintenance. 

Sealing involves the application of a protective sealant or coating to the surface of cured concrete. The purpose of sealing concrete is to create a barrier that prevents moisture, chemicals, oil, and other substances from penetrating the concrete. 

Bonding involves joining or adhering concrete surfaces or attaching concrete to other materials using bonding agents or adhesives. The objective is to create a strong and reliable bond that ensures structural integrity.