Buddhism can be summed up as overcoming the three poisons of Greed, Hatred and Delusion. (These three can also be phrased as worldly-desire, aversion, and ignorance).
Delusion is composed of three things:
1. Lack of information
3. and Disinformation
This creates wrong ideas about ourselves and others, about the world and the nature of reality, which gives rise to greed and hatred.
If we allow greed and hatred to flow through us it will increase our delusions. And vice versa, our delusions will increase greed and hatred. Which is why greed, hatred and delusion is often portrayed as three animals chasing each other's tails (see the famous image below), who in their ignorance are perpetually creating the unsatisfactory and painful samsaric existence.
But if we can spot and become aware of greed and hatred as it manifests within us and prevent it from arising, or abandon it ASAP if it does, our fundamental perceptions and attitudes about the world and reality will change. And eventually once one no longer has a trace of greed, hatred or delusion in them that person is then a fully awakened/enlightened being who is no longer generating a samsaric experience; but instead has gone beyond samsara into a state of perpetual freedom known as nibanna, a liberated state of mind that cannot be reversed.
In a nutshell, nibbanna is what the mind becomes when it is no longer fuelled by greed, hatred and delusion. And practising the noble eight-fold path is the training one undertakes to accomplish this goal.
The Wheel of Life.
The image is a famous depiction of samsara called BhavaChakra in Buddhism.
The monster at the top is Yama, the God of death and represents impermanence.
The Buddha on the outside shows that liberation is possible and points to the centre to show the root of the problem.
In the centre, greed is depicted as a rooster, hatred as a snake, and delusion as a pig - they perpetually chase one another's tails and generate karma (represented by the second circle), which in turn generates the six realms of samsara (the third circle).
The outer circle represents the twelve links of dependent origination.