Types of computers:

 not limited types of computers in fashionable shape a personal computer or laptop, there are many different types of computers which come in different sizes also, the calculator, and read barcodes (English: Barcode) available at grocery stores, ATM are the different types of computers, as it comes to certain types of computers:[9] desktop: (in English: Desktop computer), which are computers designed to be suitable for placement on a user's desktop whether at work, at home or even at school, the computer box or so-called Case along with the screen, keyboard and mouse are essential parts of this type of computer. Laptop computer, which is a computer that can be operated through the battery, so the transfer of this type of device is easier than its desktop counterpart, and because the mobile computer is easy to navigate, it can be used anywhere. Tablet computer: (English: Tablet computer), this type does not contain the mouse and keyboard, it is a computer that works through a touch screen, which is used for typing, pointing and navigating between software, and the iPad is one example of this type. Server hardware: (English: Servers), a server is defined as one of the types of computers that connect other devices associated with the same network with information and share with them, and the server device can work on a global scale as server hardware that works over the internet, and can be used via an internal network to store and share files Other types of computers: there are many electronic devices that can be classified as computers, and examples of smart phones and smart TVs. Computer operating system defines the operating system (in English: Operating system) in a computer as a program that allows computer users to run other programs and applications available on the device, through the management of many resources on the computer, such as input and output devices, volumes and network devices, etc., computer operating systems have evolved at the moment, as they were in the beginning of their design to run only one [10] kernel: it is the core part of the operating system, it controls most of the processes that take place through the device, such as reading and writing data in memory, and the kernel determines the mechanism of receiving and sending data through many devices available in the computer such as the monitor, keyboard, and mouse. User Interface: (English: User Interface), this part is concerned with the means that help the user interact with the computer, through many tools such as the desktop or through the painted icons. Application Programming Interfaces (APIs), which is intended for people who develop and create applications. Basic computer concepts the concepts of data (English: data) and information (English:: Information) for many people, where some see two terms synonymous with the same meaning but the fact of the matter is not so, the data represent the set of numbers, letters or words that do not understand themselves and do not constitute a clear and deep meaning of the human being when used individually, while the information refers to the data set arranged and coordinated where its meaning can be understood, read or even used in a useful way, and the computer converts the data into clear information by processing it through many formulas, programs or applications that are designed to do this.[11] from the two previous terms the concept of knowledge (in English: Knowledge) which is based on the principle of understanding the information generated by the processing of data, its use and use in solving various problems.[12]