Hi i sow on WC3 school http://www.w3schools.com/html/html_formatting.asp
and i am confused about text , there is a lot of text format like , small , strong,computer code text, keyboard text,sample text.
And i am confused about text, i see the difference but i do not know why is called computer, keyboard ,sample , or italic . So my question is.

Is there any special meaning about these text formats???Why is called keyboard format text ???(But i see the difference)

Thank you for your effort of reading nice people.

As you can see, theres a difference in style and font. As far as I know, most people dont use it !

<b>Note:</b> These tags are often used to display computer/programming code.

Ref: The example in the link provided by you.
Maybe they use it in code examples that you see in many books.