Answer by taking a quote from the following article:

AKB48 (pronounced A.K.B. Forty-eight) are a Japanese idol girl group named after the Akihabara (Akiba for short) area in Tokyo, where the group's theater is located. The group has expanded since then to include over 130 members as of December 2015, aged from their early teens to their mid-20s. AKB48's producer, Yasushi Akimoto, wanted to form a girl group with its own theater (unlike pop groups performing occasional concerts and seen on television) and performing daily so fans could always see them live. This "idols you can meet" concept includes teams which can rotate performances and perform simultaneously at several events and "handshake" events, where fans can meet group members.

AKB48 was founded as "idols you can meet". The group's chief producer, Yasushi Akimoto, said that his goal was to create a unique idol group which, unlike other idol groups which perform occasional concerts and appear primarily on television, would perform regularly in its own theater. The AKB48 Theater is in the Don Quijote store in Akihabara, Tokyo.  The group is split into several teams, reducing its members' workload (since the theater's near-daily performance is by only one team) and enabling AKB48 to perform simultaneously in several places. According to former member Misaki Iwasa, each team has its own theme. Team A represents freedom; Team B is idol-like, with cute costumes, and Team K has a strong, powerful image. According to an early press release the group was intended to have 16 members on each of three teams, for a total membership of 48; but its membership has varied over time, and has exceeded 120 people. New members are called trainees (Yan Jiu Sheng , kenkyusei) who are understudies for the group, performing occasionally in the theater as a team. In addition to their performances with the group, members are promoted by the Japanese mass media. AKB48 regularly hosts events, where fans can interact with the members, such as taking pictures or shaking hands with the members.  The group members' ages range from their early teens to over 20, and they are selected from regular auditions. Members are not allowed to date, and must be well-behaved; any violation of these restrictions is to be punished, possibly by expulsion from the group. AKB48 has a system that allows members to "graduate" from the group when they are older and are replaced by trainees who are promoted. Monica Hesse of The Washington Post described the AKB48 audition process as "rolling American Idol-esque".

What was concept?
to create a unique idol group