This document provides information about weeds, including their definitions, life cycles, and identification. It discusses that a weed is an undesirable plant that competes with crops for resources. Weeds can be annuals that complete their life cycle in one year, or perennials that live for multiple years. The document describes key morphological features used to identify common weed types, such as their leaves, stems, seeds, and underground structures. It explains that weeds grow for reasons such as restoring bare soil and increasing biodiversity. Effective weed management requires understanding their life cycles and why they grow, rather than simply trying to control them annually.