Meaning – The term open, refers to executing or running a program or accessing and reading a file. For example, if you wanted to read a word processor file, you could open Microsoft Word and select the file to open it. Also, most of the time, you can double-click the file and Windows automatically finds the correct program to open the file.
When referring to computer hardware or other hardware devices, open refers to physically removing a compartment, such as removing the computer case cover.
The term open also means, to make an object accessible. Whenever you access a file (that is, you edit a text file or run a program file), the operating system opens the file. Opening a file can be simple or complex depending on the operating system.