What is meant by gel?

What is meant by gel? Gel is semi-solid jelly-like substance consisting of liquid dispersed in solid network, with elastic and viscous properties, that holds shape but can flow under stress, such as hair gel, shower gel, and gelatin dessert. In chemistry, gel is colloidal system where solid forms three-dimensional network trapping liquid, called hydrogel when water-based and organogel when organic solvent based, used in many products. As verb, gel means to become firm or semi-solid, like gelatin gels when cooled, or figuratively to come together and work well, as in ideas gelled or team gelled meaning ideas formed and team bonded. In medical, gel means topical preparation or ultrasound medium. In slang, gel can mean girl in British slang, or to bond. So gel means jelly-like substance with semi-solid consistency used for styling, cleansing, drug delivery, and scientific purposes, or to solidify or to harmonize, with core idea of semi-solid cohesion and firmness.