The E suspended fourth chord is a 3-note chord consisting of the notes E, A and B.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Esus4.
Chords that are a superset of Esus4. The chords include more notes but always E, A and B.
Chords that are a subset of Esus4. These contain less notes but all of them are included in Esus4.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Esus4 chord. Feel free to save or share the image as needed.