Operating System

An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and other resources.

Random-Access Memory

Random-access memory (RAM) is a form of electronic computer memory that can be read and changed in any order, typically used to store working data and machine code. A random-access memory device allows data items to be read or written in almost the same amount of time irrespective of the physical location of data inside the memory, in contrast with other direct-access data storage media (such as hard disks, CD-RWs, DVD-RWs and the older magnetic tapes and drum memory).

Mozilla Developer Network

MDN Web Docs is an open-source, collaborative project documenting Web platform technologies, including CSS, HTML, JavaScript, and Web APIs. It provides an extensive set of learning resources for beginning developers and students.