What is uppercase and lowercase in computer?

Guys I am confused between uppercase and lower case in computer. Can any one explain me in detail with example so that I can understand better

In most situation language are used to write in different case in their writing to aid clarity. Uppercase is also called as majuscules and lower case is called minuscule.

The script which uses two separate case are also called as bicameral script. And the scripts which don’t make distinct between this case are called as unicase.
In other words upper case is capital words and lower case is small alphabets for example: “BOX” these is uppercase and “box” this lower case.

The uppercase and lower case in computer is same as the use in writing something in book or anywhere else. Example: letter “B” uppercase and letter “b” lowercase.

One should use uppercase that is capital words and lowercase that is small letter while writing in computer or anywhere else because the use of this case look the script neat and clear. One should also use this case while writing in computer(notepad, Microsoft word) because if your spelling and grammar option is on and you don’t use proper case then it will show under the word which should not containing proper case.

It is very important to use case while writing title, heading, after full stop and while starting new line or paragraph. For example: “Bat” here the starting word “B” is capital and other are small.