A website informs. A web app does work. The confusion gets expensive because the two look alike from the outside while differing by five to ten times in cost. The test is short: do users log in, and does the product store things they create? Two yes answers mean you are building an app, whatever the homepage looks like.
Most businesses end up needing both, a fast marketing site to win the search click and a product surface behind a login. The classic mistake is building the marketing site inside the app framework. It drags the SEO, slows the homepage and couples two release cycles together for no benefit to anyone.
Keep them separate, share the design system between them, and let each one be good at its own job.
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