"Gain" refers to an increase in value, quantity, or quality. It can apply to various contexts, such as finance, where it describes the profit made from investments or the appreciation of assets. For example, if you buy a stock for $50 and later sell it for $70, your gain is $20. In everyday life, gain can also refer to improvements in personal skills or health. For instance, if someone practices a musical instrument regularly, they may experience a gain in their playing ability. Similarly, a person who exercises consistently may see a gain in physical fitness and overall well-being.