Attack on Titan is a Japanese manga series written and illustrated by Hajime Isayama. The series began in Kodansha’s Bessatsu Shōnen Magazine on September 9, 2009, and has been collected into 18 tankōbon volumes as of December 2015. A television anime adaptation produced by Wit Studio and Production I.G aired in Japan on MBS between April and September 2013 and a second season is confirmed to be released in 2016. The anime has been licensed by Funimation Entertainment for North America, by Manga Entertainment for the UK, and by Madman Entertainment for Australasia.
Attack on Titan is an animated show. It is Japanese in origin. It features characters, backgrounds, and arguably a plot of some sort. It was produced by Wit Studio and aired in 2013. There will be a second season this summer.
A special thanks to Wikipedia for literally writing the review for me, although I had to cut out some parts because they were subjective.