Second generation computers were developed during 1956 - 1963.
Protecting data by copying it from the original source to a different destination is called as Backup. When an original data is lossed, to restore the information by copying the data from the source to other destination is called as Backup or Data backup.
On the right corner of the mother board RAM is located in a computer.
A computer software are of two types. They are :
1. System software
2. Application software
Systems software includes the operating system and all the utilities that enable the computer to function.
Application software includes programs that do real work for users.
Hence, Operating system is an example of system software.
A computer has a CPU which is called as Central Processing UNit or a Processor builton the mother board. It has many components like control unit and Arithmetic and logical unit.
The Arithmetic and logical unit of the CPU performs the arithmetic operations or mathematical calculations.
Hub works on layer 1 i.e, physical layer.
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