The term "well-known" refers to something or someone that is widely recognized or familiar to a large number of people. This can apply to various subjects, including celebrities, historical figures, or popular brands. Being well-known often indicates a level of fame or notoriety that makes the subject easily identifiable. In many cases, well-known entities have a significant impact on culture, society, or specific fields. For example, Albert Einstein is well-known for his contributions to physics, while Mona Lisa is a well-known painting recognized for its artistic value. Such recognition can stem from achievements, media exposure, or cultural relevance.