Weeds are unwanted plants that grow in gardens, lawns, and agricultural fields. They compete with cultivated plants for resources like sunlight, water, and nutrients, often hindering their growth. Common examples of weeds include dandelions, crabgrass, and bindweed. Weeds can reproduce quickly, making them difficult to control. They can spread through seeds, roots, or even fragments of their stems. Many gardeners and farmers use various methods, such as herbicides, mulching, or manual removal, to manage weed populations and protect their desired plants.