The term deep web refers to parts of the internet that are not indexed by traditional search engines like Google. This includes private databases, web forums, and password-protected sites, making it largely inaccessible to casual users. The deep web is distinct from the dark web, which requires special software for access and contains illicit activities. While often misunderstood, the deep web holds significant amounts of legitimate information, such as academic resources, medical records, and secure online services, serving essential functions in various sectors.