Posture refers to the position in which someone holds their body while sitting, standing, or moving. Good posture involves aligning the body in a way that reduces strain on muscles and ligaments, promoting overall health. It can affect breathing, digestion, and even mood. Poor posture, such as slouching or leaning forward, can lead to discomfort and long-term health issues, including back pain and tension headaches. Maintaining proper posture is important for activities like ergonomics in the workplace and can be improved through exercises and awareness of body alignment.