The deep web refers to the vast collection of websites and online content that cannot be accessed using regular search engines. It is estimated to be 500 times larger than the surface web, the part of the internet that is indexed by search engines such as Google and Bing.

There are some legal activities that can be done on the deep web. It can be used to access anonymous email services, anonymous social media sites, and private networks. It can also be used for research purposes, such as to access academic journals and scientific reports. The deep web can also be used to access financial information, such as stock market data and commodities prices. Additionally, the deep web can be used to find rare or hard-to-find items, such as collectibles or vintage clothing.

Overall, the deep web can provide access to a wide range of information and services that are not available on the surface web. However, it is important to remember that there are also some illegal activities that take place on the deep web, such as drug dealing and money laundering. Therefore, it is important to be aware of the potential risks when exploring the deep web.