What is the name of the specific region on an enzyme where the substrate binds to form the enzyme-substrate complex?

Define the active site: The active site is the specific region on the enzyme where the substrate binds. It is typically a pocket or groove on the enzyme's surface, shaped to fit the substrate precisely.

Differentiate between the active site and other regions: The active site is distinct from other regions like the allosteric site (where molecules bind to regulate enzyme activity) or the regulatory site (which controls enzyme function). These sites do not directly participate in substrate binding for catalysis.