ICT(software)

• Software is a set of instructions that make a computer system work.
• There are two main types of software: System software and application software.
• Systems software is essential to keep the computer working.
• Application software lets you do day-today tasks on the computer. It needs the operating system to be able to work
• System sofware may be classified as operating system, device drivers and utility software
• Device driver is a program that controls devices in a computer system.
• A user can only interact with the operating system through the graphical user interface (GUI), such as windows, and by the command line interface (CLI).
• Graphical user interface (GUI): an intuitive way of communicating with the computer through a colourful screen by clicking on icons using a mouse or trackpad.
• Command line interface: a way of interacting with a computer via keyboard input a prompt on the screen.
• The opperating system might include, the ability to load programs, device drivers to run hardware peripherals, linkers, utility software, GUI, a shell, BIOS(basic input and output system), A hypervisor and a bootloader.
• A linker is a computer program that takes files generated by a compiler and then combines them into a single file that can be executed.
• A compiler is a computer program that converts source code into a language that can be understood by a computer.
• Utilities are a part of the system software that can analyze, configure, optimize, and maintain a computer.
• A shell is an interface to allow you to access the services contained in a operating system.
• The BIOS translates the operating system comands into action by the hardware. Whithout the BIOS the operating system cannot communicate with the hardware.
• A hypervisor let you install more that one operating system into a computer if you wish. It can divide the resources such as CPU, RAM and so on.
• A bootloader is a little bit of code that is the first thing to rum when you switch on. It then boots u or starts the operating system.
• linker is an example of a system software.
• A utility is a small program used to carry out a single task, such as antivirus