Tag advertising in street marketing refers to the practice of using eye-catching and creative graffiti or street art to promote a product, brand, or message in public spaces. This type of advertising is often done without permission from property owners, making it a form of guerrilla marketing. The goal of tag advertising is to capture the attention of passersby and create a buzz around the advertised entity. It is a popular tactic among businesses looking to reach a younger and more urban audience, as well as artists seeking to showcase their work in unconventional ways. However, tag advertising can also be controversial and raise questions about the ethics of using public spaces for commercial gain.