Alfea

Alfea is a magical school where Fairies learn how to use their magical powers.

Winx Club
Alfea School of Fairies made its first appearance in the beginning of the Winx Club. Stella introduced the school to Bloom after she discovered her magical powers. From there, she and Stella attended the school. Stella, however, is a returning student and had been held back at least once.

At the school, both girls met their forever friends, Musa, Tecna and Flora, who was Bloom's roommate. The girls grew up together at the school and learned so much about magic as well as their own powers and how to utilize them.

In the second season, Layla attended Alfea just after she enlisted the help of the Winx girls to save her friends, the Pixies, after a failed attempt to rescue them, herself.

Ultimate Story
Alfea made its first appearance at the very end of the Ultimate Story special: the Celestial Winx.

Prior to the Ultimate Story, the Celestial Winx attended Alfea. Much like the original, Stella introduced the magical school to Bloom. However, Bloom already knew about her magical powers, was living on her home planet, Sparks, instead of Earth and attended the school AFTER her parents were freed from their imprisonment rather than before.

They met Musa, Tecna and Flora at the school, but unlike the original dub, Bloom didn't lie about her name and she had already known about where she was originally from.

In the second year, the king and queen of Tides brought their daughters, Layla and Aisha, to the school. They intended to have Aisha be a teacher of the school and force Layla to watch her sister. However, Aisha was shown to be less than qualified to become a teacher, enraging the parents. They then pulled their daughters away, but Layla wanted to stay since she seemed happy for the brief few moments that she was there. After some encouragement from her new friends and some overruling by the schoolboards, her parents reluctantly let her stay but tried to find ways to force her to return home. When the king and queen left with Aisha, Aisha vowed revenge against the school for "downgrading" her.