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HARDWARE AND SOFTWARE (SOFTWARE (OPERATING SYSTEMS (The O.S. and drivers…

- - - - It is the most important part of a computer, it is the 'brain' of the computer, it interprets instructions and processes data, as well as managing and controling the entire system.
    - - Memories is where we store the data and the instructions that form part of programmes.
      - RAM
        
        (Ramdom acress memorie)
        
        It's contents can be changed. It is a read-write memorie, and is erased when we turn off the computer. RAM temporaryly stores the programmes and data that are been used by the computer.
      - ROM
        
        ( Read only memorie)
        
        It's contents can only be read. It stores the data that enables the computer to operate when we turning on, and also lets the CPU communicate with other components. It isn't erased even when we turn it off.
    - - MAGNETIC
        
        PORTABLE HARD DRIVES
        
        There are external storage units that have a large capacity and a fast tranfer speed.
        
        HARD DRIVES
        
        They store data and save information, even after the computer has been turned off.
      - OPTICAL
        
        CD ROMS AND BLUE RAY DISCS
        
        Are compact discs that are read by laser beams. They have a large storage capacity: around 700 MB in the case of a CD Rom, between 4,7 GB and 17 GB for a DVD and 25 GB in the case of Blue Ray discs.
        
        SOLID-STATE DEVICES
        
        Flash Memories (used on pendrives, memory sticks and memory cards) is very compact and has a large storage capacity of up to several gigabytes. It can be accesed very quickly.
    - - INPUT
        
        KEYBOARD
        
        It lets us enter data ( characters, letters and numbers) and use the computer to perform a number of specific functions.
        
        MOUSE
        
        It allows us to perform a number of actions by moving the pointer or cursor (usually an arrow) and pressing a button.
        
        OTHER INPUT DEVICES
        
        Are the webcam, micrphone, scanner, tactile screen ...
      - OUTPUT
        
        SCREEN
        
        This displays images or text. It has buttons to control the brightness, contrats...
        
        PRINTER
        
        It prints information in different formats, on normal paper, photographic paper, and transparencies.
      - INPUT/OUTPUT
        
        It make possible to enter information into or to get information from a computer. Tablets and smartphones are proper computers that have a micro-processor, memory and storage devices. They have input devices (eg, a screen keyboard, a camara and sensor) and output devices (eg, a screen), as well as a wireless connections for sending data to a computer or to other devices