User customization refers to the ability of individuals to modify and personalize their experience with a product or service. This can include adjusting settings, changing layouts, or selecting features that best suit their preferences. For example, in software applications, users can often choose themes, fonts, and toolbars to create a more comfortable and efficient working environment. This concept is prevalent in various fields, including web design, mobile apps, and video games. By allowing users to tailor their experience, companies can enhance user satisfaction and engagement, leading to better overall performance and loyalty to the brand.