What is meditation? And what can we achieve with meditation?

What does Wikipedia say about meditation:
Meditation can be defined as a practice where an individual focuses their mind on a particular object, thought or activity to achieve a mentally clear and emotionally calm state.
We can use meditation to reduce stress, anxiety, depression, and pain.
People develop their own meditation technique.
(Wikipedia describes meditation while sitting down, repeating mantra’s and closing the eyes in a quiet environment)

We can use meditation as an individual, but we can also meditate in a group.
In our World we are used to ‘fight’ for our Peace, believing that we can only achieve Peace through War, what is actually a strange way of thinking.
Are there any other ways to accomplish Peace?
The next article shows us how we can achieve Peace in a Peaceful way:
There is Scientific Evidence that Mass Meditation can reduce War and Terrorism:

The Portal 2012 (Cobra) asks attention for the next Peace Meditation to go Viral 2018-4-15 (Look at the timetable, this can also be on the 16th of April!!!)
The Portal

The Portal Meditation Videos in different languages:
The Portal

One of the blogs that I like to follow is the Kauilapele’s Blog. He shares some Videos showing us different views on the situation in Syria:
The Syria “event” 4-14-18… 4 Videos about “Why it happened and what it means (and so on and so on)”
Kauilapele’s Blog