What a digital agency actually does
Most people picture a digital agency as a room of designers making logos. The day to day work is less glamorous and far more practical.
The everyday work
A typical small agency builds and maintains websites, sets up email and hosting, and runs advertising or search work for clients who have no in house person for it. Half the job is translation: turning what an owner means into what a developer can build, then explaining what was built in plain language. The other half is upkeep. Sites break, plugins age, inboxes fill up, and someone has to keep the lights on.
What a good brief looks like
The clients who get the best results arrive with three things: examples of sites they like, a list of pages they actually need, and a clear answer on what the site should make a visitor do. Vague briefs cost money. A page that exists only because a competitor has one will be rewritten twice and still feel wrong. Honest constraints help too. A budget stated upfront lets the agency say what is possible instead of guessing.
When you do not need one
A one person business that gets work through word of mouth may need nothing more than a simple page with a phone number and a map. Plenty of agencies will happily sell a full package anyway. If nobody can explain how a service pays for itself in extra customers, that is a reason to pause, not to sign.