What Is a UTM Link (and Why Use One)?
A UTM link is a normal link with a small tag added to the end. The tag tells…

Open any analytics report and three numbers stare back at you — pageviews, sessions, and users — and they never match. Pageviews is always biggest, users always smallest. None of them is wrong. They just count different things. Here is each one, in pictures.
Pageview
A pageview is counted each time a page loads. The visitor doesn't have to read or stay — the page just has to appear on screen.
Because reloads count too, pageviews add up the fastest. One curious visitor can rack up ten in a few minutes.
Session
A session is a single visit. It starts when someone arrives and ends after about 30 minutes of doing nothing. Think of one trip to a mall: the visit is the session, each shop you walk into is a pageview.
One visit usually holds several pageviews — which is why there are always more pageviews than sessions.
User
A user is one person (really, one device). It doesn't matter whether they visit once or come back ten times this month — they're still a single user.
Three visits, but still one user — which is why users is always the smallest number.
The whole picture
Maria finds your blog Monday and reads 2 posts. Wednesday she's back for 1 more. Friday she browses 3 pages. Here is how that one week counts:
MON
2pages
WED
1page
FRI
3pages
1 < 3 < 6 from one visitor. Multiply by thousands and you see why the totals drift so far apart.
Pick by the question
There's no single "right" number. The one to watch depends on what you're trying to learn.
For most blogs, start with users to see if your audience is growing, then watch pageviews per visit to see if people stick around.
Before you trust any of these numbers, turn on a filter so your own visits don't count. Otherwise, every time you open your own site to check it, you quietly pad your own stats. That one step keeps all three numbers honest.