The term "Remote repair, diagnostics, and maintenance" includes a wide range of technologies and applications, all of which are crucial in today's digital age. At its most fundamental level, information technology can refer to a simple phone call made to seek assistance in resolving minor technical issues. However, at its most intricate level, it comprises a comprehensive suite of computer and network applications that seamlessly integrate with one another. These applications are designed to continuously monitor the performance of various systems, identify any potential problems or faults, and automatically generate requests for attention from trained service technicians who possess the necessary expertise to address and resolve these particular issues. To address the concept of remote maintenance, it's essential to understand the core principles of maintenance. This manuscript will begin by providing an overview of maintenance and its fundamental aspects. Subsequently, the discussion will shift to remote maintenance, encompassing the nuances of remote communication and control, along with an exploration of industrial networks and their connectivity constraints. Valuable recommendations will be offered to tackle these constraints. Following this, the various facets of remote maintenance, such as teleservice, telediagnostics, and remote maintenance, will be elucidated, accompanied by insights into technological advancements in this domain. Chapter 3 will introduce some prominent platforms designed for remote maintenance in industrial settings. Finally, in Chapter 4, we will delve into the details of an experimental remote maintenance platform that was developed within our laboratory at the Institute of Maintenance and Industrial Safety