A widely followed TV animation series with fascinating characters, a captivating sci-fi premise, dynamic battle scenes, and a super-high density of information that incorporates Judeo-Christian concepts and psychoanalysis as only a few of the elements that allowed Neon Genesis Evangelion to surpass the realm of all anime that had come before it and made a work worthy of the title "New Century (Neon Genesis)." The show began airing in October 1995 with the planning, original story and production handled by GAINAX, who had previously worked on such shows as Wings of Honneamise and Nadia: The Secret of Blue Water. Hideaki Anno, a representative creator of GAINAX, was at the heart of the production work and his individuality colors every aspect of the show. A manga version by Yoshiyuki Sadamoto began running one month prior to the series premiere and new chapters are still being produced.
Neon Genesis Evangelion had the ardent support of fans, and its popularity boomed even after it finished its first run in March of 1996. Its influence was not limited to anime fans but also spread to the general populace, and it was even called the third impact, following Space Battleship Yamato and Mobile Suit Gundam. At the height of the Eva boom in 1998, the theatrical Death and Rebirth and The End of Evangelion were released. The theatrical releases were created as a separate version of the climax depicted in the TV series. Four movies retelling the story of Evangelion (without GAINAX) are to follow in the coming years.
A good place for any Evangelion related information is the Neon Genesis Evangelion Wikipedia page.