You're thinking of carnivorous plants, which are plants that have evolved to trap and digest insects and other small animals.

Here are some of the most well-known carnivorous plants:

Pitcher plants: These plants have modified leaves that form a pitcher-like structure filled with digestive fluid. Insects are attracted to the pitcher, slip in, and are unable to escape.

Sundews: These plants have sticky glands on their leaves that trap insects. The glands produce a digestive fluid that breaks down the insect.

Venus flytraps: These plants have hinged leaves with trigger hairs. When an insect touches the hairs, the leaves snap shut, trapping the insect inside.

Butterworts: These plants have sticky, glandular leaves that trap insects. They also produce digestive enzymes to break down the insects.

Bladderworts: These plants are aquatic and have tiny bladders that trap small aquatic animals.

Note: While these plants are called "carnivorous", they don't actually "eat" insects in the same way that animals do. They lack a digestive system like ours and instead use enzymes to break down the insects.