There are five different principles to yoga, with meditation being one of them. This is where there is awareness of your mind constantly. In order to perceive one’s own self in a clear manner, the mind is made to focus on one particular thing so the mind will become still. If practiced regularly, meditation will let you achieve a better sense of will along with sense of purpose. It will help your mind become clear, drastically improve concentration, while discovering the tranquility and wisdom inside yourself.

What Meditation Means

When you are brought to the present – the here and the now… and kept there, you are in state of meditation. This means meditation can easily be used in your life. Meditation does not mean writing down a grocery list of things you can focus on. You just need to be acutely aware of your being and keep your mind focus and away from random thoughts. When meditating, keep in mind about living in the present or NOW.

For concentration we need to focus on one object or thing: The focus could be how you breath, repeating a word out loud or in your mind, or even a sensation that is being felt inside your body. To live in the present it will involve the senses of listening, smelling, and feeling.
Wandering thoughts should always come back to the object being focused on: The mind will tend to wander around when you are trying to focus on one object. This is normal so do not get discouraged with practice your mind will become quiet. The mind can be stubborn so other thoughts might creep in so instead of fighting the thoughts take a minute and acknowledge them and let them go. There is no for suppressing or trying to hide your thoughts when doing mediation. There will be times when you get distracted it is okay just go back to the original focus.
When doing meditation try ignoring all sensations and thoughts that are irrelevant: You will not be taking to a new place of existence with mediation. If there are people around when you are meditating you will hear them still. The object with Meditation is to stay focused. Focusing will keep you in the NOW. Source