The answer is built-in dictionary.
Most Microsoft Word versions come with a built-in dictionary for standard grammar and spellings. These dictionaries are not comprehensive. Word also has an additional option to add a spelling error to the dictionary so that the next time you type that same error, it will not come up as a spelling error. In addition, Word can use multiple custom dictionaries that allows you to supplement with the main dictionary and check the spelling of your documents.
This is known as DNS poisoning, so called because it 'poisons' the entries of the DNS with false information.
I would say code completion. Dreamweaver does this for you. So say I wanted to make a paragraph of text, I would use <p>, and then Dreamweaver would create the closing </p> for you.
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It allows us to precisely tell where places, people (under certain circumstances), etc. are. It is the most widely relied upon mapping system in the world. Using a GPS, you can find almost any plotted (known) location on the Earth. Most mapping operations rely on a GPS and would, otherwise, fail without it.