Teachings of the Buddha. Overcoming suffering. It encourages Buddhists to follow the 8 Fold path and teaches them the process of Enlightenment. Also features how to mediate. Buddhists believe following the Dharama daily they can overcome suffering. Dhamma is one of the three refuges (which they believe protect them against the suffering they encounter from the outside world). Dhamma means to uphold and therefore Buddhists believe they have to follow the it. They also believe that it contains the natural order of the universe.
The full understanding of the Buddha's Dhamma. It leads to the realisation of the three marks of existence (that everything exists because other things are in existence. Therefore everything is interconnected and everything affects everyone). Everything happens because of something else.
When a person achieves enlightenment and becomes a Buddha. Mahayana Buddhists strive to achieve Buddhahood through meditation and Buddhist practice. In their lives they move away mentally and physically from the distractions in life that would prevent them from achieving enlightenment.
Perfected Person. Somebody who has reached Nibbana. A Buddha who has taken this path would follow the eight fold path. They may also join a Buddhist community in order to focus their attention on achieving enlightenment. Arhats have overcome the three poisons (greed, hatred and ignorance). They will no longer be reborn once they die. End of the wheel Samsara.
Someone who has reached Nirvana but chose to stay in the wheel to help others reach enlightenment. Must become perfect in these 6 areas - Generosity, Morality, Patience, Energy, Meditation and Wisdom.