Formal education: learning normally offered by an education or training center, with a structured nature (according to didactic objectives, duration or support) and that concludes with a certification. Formal learning is intentional from the learner's perspective.
Informal education: learning that is obtained in activities of daily life related to work, family or leisure. It is not structured (in didactic objectives, duration or support) and does not normally lead to a certification. Informal learning may be intentional but, in most cases, it is not (it is haphazard or random)