Weekly Shonen Jump is a weekly magazine. Commonly refered to as "Weekly Jump", it contains many popular manga titles, with a chapter and some color spreads each week. There are many other weekly magazines featuring manga, all published by Shueisha, including Young Jump and Monthly Jump.
Weekly Shonen Jump publishes a chapter of each manga featured each week on Wednesday, about Tuesday in the US. Many of these manga are very popular, and commonly become anime, some even going on to be large, popular anime series, such as One Piece, Naruto, Bleach, Toriko, Dragon Ball, Yu-Gi-Oh!, and Rorouni Kenshin. Scanlators usually scan these by about Wednesday in the U.S. Paper quality is not too good in Weekly Shonen Jump, usually being a yellowish color. Often manga are released in tankobon volumes with higher quality printing material.