"Eb" is a chord that is formed by the notes Eb, G and Bb. The chord is also known as "E-flat," "D#," or "D-sharp." Eb as a note is also known by those names.
There are Eb chord variants. For example, the Eb maj7 chord is made up of Eb, G, Bb and D. Another example is the Eb sus2 chord, which is made of Eb, F and Bb. The Eb major scale is composed of Eb, F, G, Ab, Bb, C and D. There are also other Eb scales. An example is the Eb harmonic minor scale, which is composed of Eb, F, Gb, Ab, Bb, B and D. One common feature of all these is they include the Eb note.