What's a B7sus chord?

I saw in a chord chart that Esus is an E chord with an A on the 3rd string.
A is from EFGA.

In the same way is B7sus a B7 chord with an E?
E as from BCDE.
To play it then would be a B7 chord with an open E string (1st string)?

Sorry I lack the vocab to describe the above properly, so I'm describing in pattern form.

This chord is fretted 022200
Those notes are E-B-E-A-B-E.
In other words, E A and B.
This differs from the normal E major chord ( E G# B )
in that it has A rather than the expected G#.
That's the "sus" part.
It means play the 4th note of the scale rather than the 3rd.

Think in terms of major scales.
A is from E-F#-G#-A...

When we play the "A" rather than the "G#", we have a "sus" or "sus4" chord.

Let's think of major scales again:
E as from B-C#-D#-E

If you mean fret B7sus=x21200 then the answer is "no".
The chord fretted x21200 would have the notes: B-D#-A-B-E.

We would spell B7 as B-D-F#-A.
So B7sus would be B-E-F#-A.

The "normal" open-position B7 chord is fretted x21202.
Those notes are B-D#-A-B-F#.

Playing the 1st string open would change the F# to an E.
You want to change the D# to an E.

You might play it this way: B7sus=x22202.

It's ok. I think I understand.

Let me know if you still don't understand and I'll try to explain it differently.

Yes, that's right. Chords called "sus" are really "sus4" chords. And the
"sus" or "sus4" does indeed mean exactly what you said.

Sometimes we see "sus2", which is a bit different; "sus2" means to replace the 3rd note with the 2nd, according to that same major scale.

And now you know practically everything.

I think I'm sloooowly getting the hang of it.
So if I were to see any chord with a "sus" appended to it, it's the same as
"sus4" which means replace the 3rd note with the 4th note according to the major scale.