Fairy Form

Throughout the Winx Club series the Winx have been through many levels of Fairy Power and Transformations, which each being more or less specific. So far, the Fairy Forms shown in the series are:
 * Standard Fairy Form (Winx Form in 4kids version)
 * Charmix Level
 * Enchantix Form
 * Believix Form (Speedix, Tracix and Zoomix included)
 * Sophiex
 * Lovix

Standard Fairy Form
It is the standard transformation for Fairies and the lowest level of transformation. In this form the fairies can more easily use their magic than when they are in civilian form, and can fly, as well as use very powerful spells. A fairy usually is first able to transform when she gains enough will-power and fully believes in her magic and capabilities (Such as when Bloom first transformed).

Charmix
It is the second magic level, and consists of a brooch and a bag. It boosts up the magical energy of a fairy, making her more powerful and allowing her to use magic in places where in normal fairy form she would not be able to perform any magic (the Wildlands, for example) and is earned when a fairy overcomes a great personal difficulty. However it can run out of energy and the fairy either becomes weaker or is unable to use any magic (in the Wildlands or in Lord Darkar's fortress).

Enchantix
It is the third level and the final fairy form. In this form the fairies get even more powerful, and are able to use powers such as Fairy Dust and Miniaturisation. Fairies are then able to heal themselves and other people, and they are also able to break the most powerful dark spells. It is usually earned by the fairy accomplishing an act of sacrifice to save someone from her own planet (such as Stella saving her father by coming between him and a dragon, and Musa not willing to leave her friend Princess Galatea to die in the evil fire created by Darcy in the library at Alfea, even at the cost of being herself burnt to death), but sometimes it can be earned by a very strong will-power, like Bloom's wish to prevent Valtor from winning, and by, as Maia said: "reacting to the Trix's taunts by using all the energy within her, allowing her to free her Enchantix powers, which is only something those who have the Dragon Fire within them can do. Bloom went through a long journey to be reborn from her ashes (her broken self/wil-power) and gain more strength". However an Enchantix gained in this way is incomplete and the fairy cannot use her miniaturisation powers and can easily lose control.

Higher Fairy Levels
In the fourth season Miss Faragonda mentions that there are higher level fairy forms which can be earned by fairies having already reached the final form for specific situations, and which provide the fairies with further powers.