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Here's a quick summary:

Primary focus: It hosts explicit, sexually explicit manga, doujinshi (fan-made comics), and illustrated content — mostly hentai (Japanese animated/illustrated pornography).
Audience: It is strictly intended for adults (18+).
Content types: The majority of its galleries contain sexually explicit illustrated material, though it also hosts some non-adult manga and fan art.
Legal concerns: Some content on the platform is illegal in many countries, including illustrated sexual content involving minors, which is prosecutable in numerous jurisdictions regardless of whether it is drawn or photographic.

In short: it is very much an adult content platform, and it should be avoided by minors entirely. It also carries serious legal risks depending on what content is accessed, given that some of its material violates laws in many countries.
E-hentai (also known as E-Hentai Galleries) is a large online image hosting and sharing website that primarily hosts manga, doujinshi (self-published works), and other illustrated content, much of which is adult-oriented and explicit in nature.
The site functions as a community-driven gallery where users can upload, tag, and comment on content. It contains both free and paid sections, with the paid area (called "Exhentai" or the "Sadpanda") requiring account access.
Beyond explicit material, the platform also hosts a significant amount of non-adult content, including:

Fan-made comics and artwork
Translated manga from various languages
Original doujinshi from Japanese conventions like Comiket

The site has been a notable part of internet culture since the early 2000s and is one of the largest repositories of scanned and translated manga/doujinshi on the internet. It operates in a legal gray area in many countries due to its content.
Important note: A portion of its content involves material that is illegal in many jurisdictions, including content that sexualizes minors. Such material is harmful and illegal regardless of its illustrated nature. Many countries treat drawn/illustrated child sexual abuse material the same as photographic material under the law.