Explanation:

The informal organization is defined as a network of social and personal relationships that occur in a work environment. It is a fact that an informal organization co-exists with a formal one and generally emerges because of default. Although formal principles do not bound these, they are still considered an integral part of formal organization.
The informal organization is the interlocking social structure that governs how people work together in practice. It is the aggregate of norms, personal and professional connections through which work gets done and relationships are built among people who share a common organizational affiliation or cluster of affiliations. It consists of a dynamic set of personal relationships, social networks, communities of common interest, and emotional sources of motivation. The informal organization evolves, and the complex social dynamics of its members also.

Tended effectively, the informal organization complements the more explicit structures, plans, and processes of the formal organization: it can accelerate and enhance responses to unanticipated events, foster innovation, enable people to solve problems that require collaboration across boundaries, and create footpaths showing where the formal organization may someday need to pave a way.