The term "fan service" is a common expression used in media and entertainment to describe content that is specifically designed to appeal to or cater to fans. This can take many forms, including gratuitous scenes of attractive characters (usually women) in revealing clothing or swimsuits, over-the-top action sequences, or other moments that are intended to generate excitement and pleasure among the audience.
Fan service is often used as a way to keep audiences engaged and interested in a particular media property, such as an anime series or video game. It can also be seen as a way for creators to show their appreciation for their fans by including elements that they know will be popular among them.
However, some critics argue that fan service is often used as a crutch to distract from weak storytelling or lackluster characters. Others believe it objectifies women and reinforces negative stereotypes about gender roles in media. Regardless of one's personal feelings on the matter, fan service remains an important aspect of many popular media properties and is likely here to stay for the foreseeable future.