Weeds are unwanted plants that grow in gardens, lawns, and agricultural fields. They compete with desired plants for resources like sunlight, water, and nutrients, often hindering their growth. Weeds can spread quickly and may produce large quantities of seeds, making them difficult to control. Common types of weeds include dandelions, crabgrass, and bindweed. They can thrive in various environments and often adapt well to different soil types. Managing weeds typically involves methods such as manual removal, mulching, or the use of herbicides to minimize their impact on cultivated plants.