Manga conform to a style developed in Japan in the late 19th century, and the form has a long prehistory in earlier Japanese art. The term manga is used in Japan to refer to both comics and cartooning. Outside of Japan, the word is typically used to refer to comics originally published in the country. Manga stories are typically printed in black-and-white - due to time constraints, artistic reasons and to keep printing costs low. In Japan, manga are usually serialized in large manga magazines, often containing many stories, each presented in a single episode to be continued in the next issue.
Comics is a medium used to express ideas with images, often combined with text or other visual information. It typically takes the form of a sequence of panels of images. Textual devices such as speech balloons, captions, and onomatopoeia can indicate dialogue, narration, sound effects, or other information. The history of comics has followed different paths in different cultures. It traced to European comics of the 1830s, American comics of early 20th century and Japanese origins as early as the 12th century.
Source: Wikipedia