TYPO

Any of you have ever heard or seen the word “typo” used in a conversation? #WOTD
When a word is misspelled (by typing mistake), we usually say it’s a “typo”. But if the word is misspelled because the person really doesn’t know the right word, it is called “spelling error”, not “typo”. As a conclusion, “typo” is a mistake in spelling, or probably typing the wrong word, because of typing mistake. If the grammar is wrong, it is called “grammatical error”.

The “typo” can usually be seen when the wrong letter is located near the correct letter in a keyboard. For example, “Shw” instead of “She”. E and W are located next to each other in qwerty keyboards. Or “Poeple” instead of “People”, the O might be typed too fast before the E is typed.
The word “typo” is a short term of “Typographical Error”. Historically, typographical error or typo is referred to mistakes in manual type-setting.
In instant messaging, users often send messages in haste and only afterwards notice the typo. The typo is usually corrected by sending a subsequent message where an asterisk precedes or follows the correct word.
There’s also “thumbo”, a typographical error made during thumb typing, especially on the keypads of cellphones and smartphones. The word “thumbo” is a portmanteau of “thumb” and “typo”. It usually happens on cellphone users, because they only type with their thumbs.




http://englishtips4u.com/2012/08/27/wotd-typo/