What are enzymes? Write in brief the mechanism of enzyme catalysis.

(N/A) Enzymes are complex,nitrogenous organic compounds produced by living plants and animals. They are essentially protein molecules of high molecular mass that form colloidal solutions in water. They are also known as 'biochemical catalysts'.
Mechanism of enzyme catalysis:
$1$. Binding: The surface of an enzyme contains cavities with characteristic shapes,which possess active groups such as $-NH_2$,$-COOH$,etc.
$2$. Complex Formation: Reactant molecules (substrates) with a complementary shape fit into these cavities,similar to how a key fits into a lock,forming an enzyme-substrate $(ES)$ complex.
$3$. Product Formation: The $ES$ complex then decomposes to yield the product and regenerate the enzyme.
This process is represented as:
$E + S \rightleftharpoons ES \rightarrow E + P$
(Where $E$ = Enzyme,$S$ = Substrate,$ES$ = Enzyme-Substrate complex,$P$ = Product)