A, The, and maybe some other title words...
What form of words are they? I could better state my question if I knew my own answer but I have no clue what they are...
An, a, and the are called determiners. They modify nouns and tell us if a noun is specific or non-specific. For example:
non-specific: I want an apple. <any apple>
non-specific: I want a red apple. <any red apple>
specific:I want the red apple(s) on the table. <specific red apple(s)>