Zephyr is a versatile Warframe built for mobility.
She is the only Warframe to resist the effects of gravity, causing her to jump higher and descend more slowly and with greater control than any other. This, paired with her above average speed, gives her an unprecedented ability to make the most of her environment. In conjunction with her abilities, she is able to find short cuts through maps and skip wall runs. Perhaps most usefully, she is able to access higher places than other frames, allowing her to provide cover fire for her fellow Tenno and Defense targets while avoiding damage.
Zephyr is in her element when she is not restricted vertically. Air superiority is her strength and on open maps with high/no ceilings she shines in combat. She is ideal for use in Interception missions, where teams tend to split up to focus on each point. She can move from point to point faster than most other Warframes and can defend them, capture them or revive teammates who were down on the point. Tornado allows her to cause massive disruption to enemies, preventing them from capturing points and generally sowing chaos. On the ground, her agility allows her to avoid the line of fire and strike down enemies before they're able to get a bead on her.
She is also deceptively tough as her shields and health are above average, in spite of her low armor. Using Redirection, Vitality , and/or Vigor in combinations will have a larger effect on Zephyr than on some other Warframes. Furthermore, if Turbulence is utilized, Zephyr becomes immune to projectiles and has a high chance to dodge hitscan bullets. This makes her very powerful as a solo frame even on long Void runs, especially when there are no enemies to Dispel her Turbulence. Keep in mind that entering a Nullifier's bubble will dispel Turbulence.