“Prayer is when the mind is one-pointed and man talks to Infinity. Meditation is when the mind becomes totally clean and receptive, and Infinity talks to the man.” – Yogi Bhajan
To understand what meditation is first we must understand what the mind is. The mind, or the thinking intellect was given to us to serve our purpose and consciousness. The mind in its automatic nature went out of control and began to point to itself as the truth, rather than the consciousness that drives it. The main tool of the mind is the words—the building blocks of all our thoughts—and through this tool a reality unfolds before us that is not necessarily related to the true reality, rather a reality told to us again and again by the rebellious mind.
We all know the feeling when we’re walking along a path, our feet are moving, our breath is automatic, the way is spread before us in all its beauty, but the mind is in another place and time, busy in other thoughts that divert us from that moment, or actually, from life itself. And like this, one can lead a double life, on the one hand living in the simple reality of the moment, while on the other hand, spending a lot of our time in our minds and thoughts. If our thoughts were only positive and pleasant we would have never heard about the idea of meditation.
But since this is the case, here are a few words about meditation: Meditation is a science, a science that creates a situation where the active waves of the mind relax and give way to subtle frequencies which can catch the reality as it is. Every moment the mind generates thousands of thoughts, some of which are considered by us, while others pass into the subconscious and affect our lives. The process of meditation allows thoughts to pass through us and for the mind to be cleansed of the mass of unnecessary thoughts and by that, also cleansing the subconscious. According to Yogi Bhajan, meditation is what stops the mind, however, the mind surrenders to the soul and the soul surrenders to the truth the moment in which you prefer the word of truth over the word of your ego.
Meditation is a simple procedure that allows the mind to surrender to this moment as it is. In this process we use the mind itself to concentrate for us. By doing that, the mind returns to its true nature as a tool for awareness and gives up its illusory position as having control over awareness, life or the self.
We can compare reality to a bright sky, the mind to clouds, and meditation to wind that scatters the clouds, allowing the conscious reality that is always there to be experienced.
So meditation can be any activity that through focus and dedication it changes our state of awareness, making us present and aware. Connected to this moment—here and now.
In Kundalini Yoga there is a huge variety of meditations combining different breathing patterns, mudra, bandhas, and sometimes mantra. Meditations for relaxation, for healing, for children, for couples, walking meditations and gazing meditations.
Here are examples:
Healing Addiction:
This meditation aids in the healing of physical, emotional, and mental addictions by combining specific actions with mantra to balance the area in the brain where addiction is rooted.
Tershula Kriya “Thunderbolt of Shiva”:
This powerful meditation directly stimulates the Kundalini energy for self-healing. It is helpful in healing psychological disorders, phobias, and personality imbalances.
Kirtan Kriya: 
This meditation combines the mantra SaTaNaMa with several mudras, bringing mental balance, refinement to the senses, and insight, along with the list of benefits each specific mudra provides.
Mala Meditation: 
This meditation makes use of the meditative tool called a mala, which consists of either 27, 54, or 108 beads strung across a silk thread. Its benefits are vast, including improvement of health and vitality, deepening wisdom, and increasing patience.
Tratakum Meditation:
There are many different methods to this meditation, gazing at a candle, the horizon, or a photograph of an enlightened guru, however all paths eventually lead to the same destination of experiencing your Infinite Self in the world around you. The experience of this meditation is said to be a must for any student of Kundalini Yoga.
Gong Meditation: 
The vibration of the gong has an impact on the body and its meridians, releasing us from emotional blockages and our endless streams of thought, stimulating the glandular system and circulation, and reducing tension.