Technical support refers to a plethora of services by which enterprises provide assistance to users of technology products such as mobile phones, televisions, computers, software products or other electronic or mechanical goods. In general, technical support services attempt to help the user solve specific problems with a product rather than providing training, customization, or other support services. Most companies offer technical support for the products they sell, either freely available or for a fee. Technical support may be delivered over by e-mail, live support software on a website, or a tool where users can log a call or incident. Larger organizations frequently have internal technical support available to their staff for computer-related problems. The Internet can also be a good source for freely available tech support, where experienced users help users find solutions to their problems. In addition, some fee-based service companies charge for premium technical support services.Coverage of supportTechnical support may be delivered by different technologies depending on the situation. For example, direct questions can be addressed using telephone calls, SMS, Online chat, Support Forums, E-mail or Fax; basic software problems can be addressed over the telephone or, increasingly, by using remote access repair services; while more complicated problems with hardware may need to be dealt with in person.Categories of technical supportCall inThis type of technical support has been very common in the services industry. It is also known as "Time and Materials" (T&M) IT support. The customer pays for the materials (hard drive, memory, computer, digital devices, etc.) and also pays the technician based on the pre-negotiated rate when a problem occurs.