Networking or "you know more people than you think!"
Effective networking rests on knowing and being interested in people and in their lives. True networks consist of individuals with some common experiences,shared values and knowledge f each other's abilities. Real , functional networks are made of people who care about each other, and are willing to help and be helped in their lives. Such networks are precious and should not be misused by careless people who are just looking for a job, with no intention of reciprocating the favors gained from the network.
Practically speaking, more people you know, the more jobs you will hear about (especially the great majority of jobs, which are never advertised publicly.)