It is a term used for small scale, unregistered enterprises with little or unstable revenue.
The jobs in this sector are not regulated by the government thus the people employed are not protected by labour laws, acts, policies and benefits that are given to the people in the formal sector (people working in private or government jobs).

Example:
Jobs such as rickshaw puller, vegetable seller, tailor, tea or paan shop etc all fall under the unorganised sector.