Server-side tracking is the most oversold thing in analytics right now. It is also, for the right business, genuinely worth the money. Both statements are true, and the industry has a strong financial incentive to only tell you the second one.
What it is, in one paragraph
Instead of the visitor's browser sending events directly to Google, Facebook, and friends, the browser sends them to a server container you control, which forwards them on. That single change is why it works: ad blockers and browser privacy features are much worse at blocking traffic to your own domain, and the server can enrich events before forwarding, which improves ad-platform match rates.
What this hub covers
The pages under this guide take the decision apart one question at a time: whether you need it at all, what it honestly costs to run, and what it does and does not protect you from. The one thing they all agree on: server-side tracking is not a way around consent. The GDPR applies to the data, not to the transport route it takes.
Start with do you actually need server-side tracking? It is the question everything else depends on, and for a lot of businesses the honest answer is "not yet." My own setup work treats it the same way: it is a separate €1500 add-on to Tracking Foundation, and I will say plainly on the call if your ad spend does not justify it.