What does female Buddha mean? I got introduced to this &quot;Female Buddha&quot; when I was looking name for my friend's daughter.
So what does female Buddha mean?
Wikipedia :

Tara (Buddhism)
Tara (Sanskrit: तारा, tārā; Tib. སྒྲོལ་མ, Dölma), Ārya Tārā, or Shayama Tara, also known as Jetsun Dölma (Tibetan language: rje btsun sgrol ma) in Tibetan Buddhism, is an important figure in Buddhism. She appears as a female bodhisattva in Mahayana Buddhism, and as a female Buddha in Vajrayana Buddhism. She is known as the &quot;mother of liberation&quot;, and represents the virtues of success in work and achievements. She is known as Tara Bosatsu (多羅菩薩) in Japan, and occasionally as Duōluó Púsà (多羅菩薩) in Chinese Buddhism.

My question is what does this concept mean is she a person who appeared in past who's name is Tara?
Or is it philosophical concept that meditators seen she's appearing?
Also why this is not exist in Thervada Buddhism when statue is in Bihar state of India?
Also why this is not exist in Thervada Buddhism when statue is in Bihar state of India?

Probably because there's no concept of a female Buddha according to Early Buddhism (by Early Buddhism, I mean the earliest text strata translated into both the Theravada's Nikayas and Mahayana's Agamas).

“He understands: ‘It is impossible, it cannot happen that a woman could be an Accomplished One, a Fully Enlightened One—there is no such possibility.’ And he understands: ‘It is possible that a man might be an Accomplished One, a Fully Enlightened One—there is such a possibility.’ He understands: ‘It is impossible, it cannot happen that a woman could be a Wheel-turning Monarch…that a woman could occupy the position of Sakka [66]…that a woman could occupy the position of Māra…that a woman could occupy the position of Brahmā—there is no such possibility.’ And he understands: ‘It is possible that a man might be a Wheel-turning Monarch…that a man might occupy the position of Sakka…that a man might occupy the position of Māra…that a man might occupy the position of Brahmā—there is such a possibility.&quot; ~~ MN 115 ~~

Now before some modern-day feminist about to start a massive protest, pay close attention to the next sentence too, basically it said that on the flip side, men's evil has no equal, so much that this gender is the only one capable of occupying the most evil office ever exists, Mara!