The great Psychologist Carl Jung coined terms ‘Introvert’ and ‘Extravert’ in Psychology. Generally speaking Introverts are those persons who turn their feelings inwards more often than others. If you extrapolate it, Introverts are those who observe their thoughts and feelings. Introverts are persons who have less subconscious weightage than extroverts. [Spellings ‘Extravert’ and ‘Extrovert’ are accepted equally!]
Introverts and Extroverts are generally born with their specific traits and brains. It does not mean that a person cannot become an introvert or an Extrovert if his circumstances force him. A person who was an Extrovert since his childhood might become an Introvert owing to some challenges and similarly a person who was born an Introvert might become an Extrovert. Brain Plasticity is a highly investigated area in the modern science these days.
Introversion is a voluntarily adopted mode of living or change in the life style to be able to adapt to the situations. Introversion makes you take ‘memes of Introverts’ to become more capable of solving your problems. Everything which enables you to get in touch with yourself contributes in Introversion. Meditation is one of the examples of Introversion. Most meditative persons are most introvert persons. Introversion need not be adopted as a permanent behavioural trait but rather as a temporary trait to solve imminent problems. A few tools to help the process of Introversion might be writing down your thoughts in a notebook or to speak less for a while or to meditate on your thoughts etc. Introversion is a process to muster your energies to solve your problems more effectively.