Your drishti [1], quite simply put, is your gaze, or where you look.

When you focus your eyes on a fixed, non-moving, single point, your attention naturally follows, making it easier to concentrate (during meditation [1]) or balance (during yoga). Your drishti will help you block out distraction, so you can draw your awareness inward.

When using your drishti, don't squint or strain your eyes - the muscles on your face should be relaxed and the gaze should be soft.

In yoga, while your drishti might help you stay up in Crow [1] pose, it can also be used to deepen your stretch, as in twisting poses like Bound Squat [1] - your drishti can help motivate you to move further into a pose. It can also help you to hold poses for a longer amount of time.

Yoga poses have specific drishti points that are used. In Ashtanga Yoga [1] there are 8. Want to hear more about them? Then

Nasagrai Drishti: gaze at the tip of the nose, as used in upward facing dog and standing forward fold poses.
Angusta Ma Dyai Drishti: gaze at the thumbs, as used in warrior I.
Nabi Chakra Drishti: gaze at the navel, as used in downward facing dog.
Pahayoragrai Drishti: gaze at the toes, as used in hand to toe pose and most seated forward bends.
Hastagrai Drishti: gaze at the hands, as used in triangle and warrior II.
Parsva Drishti: gaze to the side, as used in seated spinal twists.
Urdhva Drishti: gaze upwards, as used in warrior angle, balancing half moon, and prayer twist.
Naitrayohmadya or Broomadhya Drishti: gaze at the third eye or forehead, as used in fish, upward forward fold, and reverse warrior II.

You can use these drishti points for other kinds of yoga [1] as well. If you're not sure where to look in certain poses, do what comes naturally, or ask your yoga instructor [1].