Comma:
The comma ( , ) is a punctuation mark. It has the same shape as an apostrophe or single closing quotation mark in many typefaces, but it differs from them in being placed on the baseline of the text. Some typefaces render it as a small line, slightly curved or straight, or with the appearance of a small filled-in number 9.
The comma is used in many contexts and languages, principally for separating things. According to the Oxford English Dictionary, the word comma comes directly from the Greek komma (κόμμα), which means something cut off or a short clause.
Apostrophe:
The apostrophe ( ’ or ' ) is a punctuation mark, and sometimes a diacritic mark, in languages that use the Latin alphabet or certain other alphabets. In English, it serves two main purposes—the omission of one or more letters (as in doesn't for does not) and the marking of possessives (as in the cat's whiskers). (In strictly limited cases, it is allowed to assist in marking plurals, but most authorities[who?] now disapprove of such usage; see Use of apostrophes in forming certain plurals.) According to the OED, the word comes ultimately from Greek ἡ ἀπόστροφος [προσῳδία] (hē apóstrophos [prosōidía], “[the accent of] ‘turning away’, or elision”), through Latin and French.
The apostrophe is different from the closing single quotation mark (usually rendered identically but serving a different purpose), and from the similar-looking prime (which is used to indicate measurement in feet or arcminutes, and for various mathematical purposes).
What's so difficult scoobzie/diablo/retardx?