Microsite is a short, self-contained site built for one job: launch a product, run a campaign, or spotlight a brand moment. A handful of pages, its own URL or subdomain, its own story. When the campaign ends, the microsite can retire without touching the main site.
It is not a landing page. A landing page is usually one screen and one CTA. A microsite can have a story, specs, FAQs, and still aim at conversion. Teams often build it in a CMS like WordPress, with copywriting aimed at one audience and analytics on that campaign alone. A soft launch sometimes lives here before the product joins the mothership.
A real-life example of a microsite
A Midtown importer launches one cooker line. The corporate site still sells the whole catalog. The microsite is five pages: the hero product, how it works, recipes, press, buy. Ads point here so nobody gets lost in twenty other SKUs. After the launch, they fold the best pages into the main WordPress site.
Give the campaign a stage, then measure it. Case: Launch Your Product with a Custom WordPress Microsite. For the one-action cousin, think landing pages inside a funnel.