4chan la mot trang web dien đan hinh anh (imageboard) tieng Anh. Nguoi dung thuong đang (post) mot cach an danh, voi nhung bai đang moi nhat xep tren. 4chan đuoc chia thanh nhieu bang (board) voi noi dung va nguyen tac khac nhau. Nguoi dung khong can va cung khong the đang nhap (tru khi tuyen nhan su).
4chan mo cua ngay 1 thang 10 nam 2003, no ban đau đuoc dung đe đang hinh va tranh luan ve manga va anime, va dua tren nhung dien đan hinh anh Nhat Ban, đac biet la 2chan. 4chan nhanh chong pho bien va mo rong, du mot phan lon 4chan van tap trung vao otaku, anime, va nen van hoa Nhat Ban.
Trang nay lien quan đen mot so tieu van hoa va hoat đong Internet, đang chu y la Anonymous va Project Chanology. Nguoi dung 4chan cung đa tao nen hoac pho bien cac meme tren Internet nhu lolcat, Rickrolling, "Chocolate Rain", Pedobear. Bang "Random", hay "/b/", la bang đau tien cua trang, va cung nhan nhieu luoc truy cap nhat. Nhu ten, bang Random chi co luat le đang bai toi thieu. Gawker tung phat bieu rang "đoc /b/ se lam ban chay nao". The Guardian tung tom tat cong đong 4chan la "đien ro, tre con... thong minh, nuc cuoi va đang bao đong."


Boi canh 4chan khoi đau 2003 trong phong mot hoc sinh 15 tuoi ten Christopher Poole, nguoi đang bai duoi ten "moot". Truoc khi bat đau 4chan, Poole đong gop thuong xuyen tren dien đan Something Awful. Anh co y đinh lam 4chan tro thanh noi tranh luan ve manga va anime, mot phien ban cua dien đan hinh anh Futaba Channel ("2chan") Nhat Ban.
Trang web đuoc chia lam sau phan: Japanese culture (van hoa Nhat Ban), Interests (thu vui), Creative (sang tao), Adult (nguoi lon - 18+), Other (khac), va Misc (18+). Cac phan nay lai đuoc chia thanh cac bang đe tranh luan ve cac chu đe nhu anime va manga (/a/), ky thuat va cong nghe (/g/), the thao (/sp/), nhiep anh (/p/), am nhac (/mu/), hentai (/h/), torrent (/t/), du lich (/trv/), the chat (/fit/), cung nhu mot bang hon tap (/b/).


Cac board trong 4chan Japanese culture (van hoa Nhat Ban):

Anime & Manga
Anime/Cute
Anime/Wallpapers
Mecha
Cosplay & EGL
Cute/Male
Flash
Transportation
Otaku Culture
Virtual YouTubers
Video Games

Video Games
Video Game Generals
Video Games/Multiplayer
Video Games/Mobile
Pokemon
Retro Games
Video Games/RPG
Video Games/Strategy
Interests (So thich)

Comics & Cartoons
Technology
Television & Film
Weapons
Auto
Animals & Nature
Traditional Games
Sports
Extreme Sports
Professional Wrestling
Science & Math
History & Humanities
International
Outdoors
Toys


= Creative (sang tao) =
Oekaki
Papercraft & Origami
Photography
Food & Cooking
Artwork/Critique
Wallpapers/General
Literature
Music
Fashion
3DCG
Graphic Design
Do-It-Yourself
Worksafe GIF
Quests


= Other (Khac) =
Business & Finance
Travel
Fitness
Paranormal
Advice
LGBT
Pony
Current News
Worksafe Requests
Very Important Posts


= Misc. (NSFW) =
Random
ROBOT9001
Politically Incorrect
International/Random
Cams & Meetups
Shit 4chan Says


= Adult (NSFW) (Nguoi lon) =
Sexy Beautiful Women
Hardcore
Handsome Men
Hentai
Ecchi
Yuri
Hentai/Alternative
Yaoi
Torrents
High Resolution
Adult GIF
Adult Cartoons
Adult Requests


Tham khao Lien ket ngoai Website chinh thuc
TED talk on 4chan
Now 10 years old, 4chan is the most important site you never visit Daily Dot interview with Christopher Poole
A more complete history of 4chan