A A7sus4 chord contains the notes A, E, G, D. It is built from the dominant 7th suspended 4th formula 1 - 4 - 5 - ♭7, with A as the root.
What is the difference between Asus4 and A7sus4?
Both replace the third with a fourth, so neither is major or minor. A7sus4 simply adds a flattened seventh (G) on top, which gives it a bluesier, more restless character than the plainer Asus4 — more pull toward whatever chord comes next.