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Landing page or showcase site: the real difference and when you need which

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I often talk to someone who asks me for "a landing page" but actually means a showcase site, or the other way round: they want a full site to promote a single offer that would really need its own dedicated page instead. They're two different tools, built for different needs, and using the wrong one doesn't save anything: it wastes the work put into bringing visits to the page.
What a landing page does
A landing page exists for one goal only: getting whoever reads it to take a single action tied to a specific offer. Requesting a quote for that service, booking that demo, downloading that guide, buying that specific product. Everything on the page is built around that one action: the copy, the images, the call-to-action button.
That's why, in the most common case, it doesn't carry the navigation menu the rest of the site has: every link that leads elsewhere is a missed chance to get that action completed. It isn't an absolute rule (a landing page tied to a stable offer can stay online for a long time, and some stay quietly linked to the rest of the site), but the principle holds: fewer ways out, more chance whoever arrives does that one thing.
It pairs well with a paid campaign, on Google or on social, because whoever clicks an ad for a specific offer needs to land on exactly that offer, not a menu to explore. But it works just as well for traffic coming from an organic search on a specific keyword, or from a link sent by email: the condition is that whoever arrives is already looking for that specific thing, not the business in general.
What a showcase site does
A showcase site presents the business as a whole, not a single offer. Who you are, what you do, finished work, the services you offer, how to get in touch: several pages, a menu connecting them, and more than one way for whoever arrives to find what they're looking for, not just what you decided upfront. It's the business's stable footprint, the place where whoever searches for you by name ends up, or whoever wants the full picture before writing to you.
Single-page showcase sites exist too, with sections reached through an anchor menu instead of separate pages: they're still showcase sites, because the purpose is presenting the whole business, not guiding toward one action. I've written about this for a specific case, people who work on commission, in website for artisans.
The real test: how many goals it needs to serve
The right question isn't "how many pages do I need", it's how many goals does that page need to serve. If the visitor needs to be able to do one thing, request that quote, book that date, download that document, a landing page strips away everything that could distract from that action. If instead they need to be able to explore, compare, get a sense of things before deciding whether to write, the landing page chokes them: it's missing the path to everything else they'd need to trust you.
A showcase site trying to serve too many goals on a single page loses whoever is looking for a specific offer inside a menu talking about something else. A landing page used as an entire site leaves out whoever wants to know the business before choosing. The problem doesn't show up in the page itself: it shows up in how long whoever arrives stays, and in how many of those actions actually get completed.
When you need both
They aren't alternatives: they often work better together. A landing page for a specific campaign, which points back to the showcase site for whoever isn't ready to act yet and wants a broader sense of the business first. It's the most common setup for anyone launching a new service while already running a business with its own showcase site online: the campaign leads to the dedicated page, and the dedicated page stays quietly linked to where the rest can be found.
How much they cost
A landing page isn't necessarily cheaper than a showcase site just because it's a single page: the price depends more on how much copywriting and testing work went into that page than on the number of pages in the site. A well-crafted single page, with copy written by someone who knows how to sell that specific offer, can cost as much as or more than a showcase site of a few pages built from a standard template. The Italian market brackets for both cases, with the build timeline, are in how much does a website cost.
If you're not sure which of the two you need, get in touch and tell me what you need whoever lands on the page to do: I'll give you an answer, even if it's that you're better off with a different setup than the one you had in mind.