This is still the most effective, but not the most popular way for people to look for a job. Networking is powerful in several ways. First, talking to people and building relationships is a rich source of underground information and the hidden job market. Or, from the company perspective, there are frequently employees on performance probation with the potential to be replaced. In addition, companies don't hire people.
People hire people.
Someone who knows you can make a personal introduction or let his or her name be used to allow you easier access to someone who has decision-making authority. The more people who know who you are and what your goal is, the more expansive your opportunities. Agencies or executive recruiters. These professionals can be a valuable resource to add to your search arsenal. Executives in particular, however, might rely too heavily on search firms, deluding themselves that the recruiters are acting as their personal agents, which of course they are not.