Direct hired IT support is an individual person that an organization hires as a full-time employee to provide IT support.
The business takes on the hiring, training, and management of a direct hire. The responsibility for hiring this technology professional falls on your internal staff. Vetting candidates for this position could be complex.
A single person has the benefit of being dedicated to the business and available during business hours, but faces the limitations of being a single person. One person can only work on one IT issue at a time. If two people are having a problem at the same time, someone will be waiting for access to IT support.
Also, a single IT person will come into an organization with their fixed set of skills. When they hit a problem that is outside of their skill set or out of their depth, they have to rely on Internet research to find a fix or ask the business to pay for expensive training.
Even if an organization has hired and trained this resource very well, there is a high risk to the business of losing institutional knowledge or repeating the hiring, training, and management process again if there is turnover in this position.