Question

what are enzymes, and for what purpose are they usually used?

Explanation:

Enzymes are biological catalysts (proteins or RNA). They speed up chemical reactions in living organisms (e.g., digestion, metabolism).

Answer:

Enzymes are biological catalysts (mostly proteins, some RNA). They are used to speed up chemical reactions in living systems (e.g., breaking down food in digestion, facilitating metabolic pathways).