What is Zen?

The aim of the Zen sect, one of the denominations of Buddhism, is to meditate in order to eliminate hesitation or delusion and awaken to the truth.
One of the practices used to acquire serenity of mind is zazen, which means to sit in silent meditation.
Zen existed in India before Christ, and it was later spread by priests including Bodhidarma. who is believed to have continued meditating in a sitting posture for nine years.
After studying in China, Japanese priests introduced Zen to Japan in the 12th and 13th centuries.
The Zen sects in Japan today are the Rinzai sect, Soto sect, and Obaku sect.