What is the importance of the enzyme?

Enzymes break down proteins for use in the body, and they're to speed up the reaction of the product.

eg - photosynthesis enzymes are used to speed up the reaction to make it into glucose and oxygen.

Enzymes (pronounced /ˈɛnzaɪmz/) are proteins that catalyze (i.e., increase the ratesof) chemical reactions.[1][2] In enzymatic reactions, the molecules at the beginning of the process are called substrates, and they are converted into different molecules, called the products. Almost all processes in a biological cell need enzymes to occur at significant rates. Since enzymes are selective for their substrates and speed up only a few reactions from among many possibilities, the set of enzymes made in a cell determines which metabolic pathways occur in that cell.