When buying sheet music, what does it mean when the book says chords only?

Answer 1

You get printed lyrics with chords above the syllables where you are to strum or play the chord.

There are no lines of music or notes, just words and chords.

To contrast:
A 'leadsheet' is one line of treble clef with the melody notes printed. The lyrics are below the clef, and the chords are printed above.

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Answer 2

Don't by sheet music, go to blanksheetmusic.com. All this courtosey of Coo Hwip Stewie