[nl]

Yes.

But also performance tuning and administration and interviewing new employees and understanding their business and suggesting new software for them and telling them not to buy new software.

It's whatever you are better than them at and they will pay money for.

[StavrosK]

Thanks, I suspected it was a catch-all term, then. It also turns out that my side-business is consulting, but I wasn't aware of the term. Now that you've explained it to me, I can better market my skills, thank you.

[petervandijck]

Consulting = contracting, but you make more money. You basically sell yourself as someone who adds value, not just someone who fills in the blanks.