Potential difference-its meaning

We have already known potential is the workdone to take the test charge from infinite distance to a point against the electric field.
But potential difference is the workdone by the test charge in taking from one point to another point against the electric field

One point here to remember that the field produced by a positive charge is always directed away from the charge, so we need to do work and hence the potential at any point around the positive charge is positive.