A WordPress feature allowing several sites to run from a single installation, sharing core infrastructure and, where set up for it, a component library, while each site keeps its own content — useful for a network of similar sites like affiliate markets, less useful for genuinely dissimilar properties.
A Multisite network shares the core WordPress installation, plugins, and — if built that way — a component library across every site on the network, while each site retains its own content, users and, if configured, its own theming.
A network of affiliate sites sharing brand and technical requirements is the clearest case, consolidating maintenance overhead across many similar properties. See WordPress Multisite for the fuller assessment of when it fits.
Genuinely dissimilar sites with different hosting or functional requirements often do better as separate installations, since Multisite’s shared infrastructure becomes a constraint rather than a benefit when the sites do not actually need much in common.
Potentially, yes — because Multisite shares infrastructure across all sites in the network, a problem at the network level, such as a plugin conflict or a server issue, can affect every site rather than staying isolated to one. That’s a real trade-off against the maintenance and consistency benefits Multisite offers, and it’s worth weighing against your tolerance for shared risk.
Yes, each site in a Multisite network can look distinct while still drawing on a shared underlying component system, so you get visual flexibility without duplicating the build work for every site. See design systems for how that shared component approach works in practice across multiple pharma brand or country sites.
Related but not identical — Multisite is a specific WordPress feature for running several sites from one installation, while enterprise WordPress is the broader set of scaling, security, and governance practices a larger organisation needs regardless of whether it uses Multisite. See enterprise WordPress for that wider context Multisite often sits within.
There’s no hard technical ceiling, but practical limits come from hosting resources, how much each site’s content and traffic differs, and how much shared maintenance risk your team is comfortable accepting. Companies running country-specific pharma sites often keep networks to a manageable number of related sites rather than consolidating everything into one, to limit the blast radius of any single issue.
Tell us about your sites and we will assess whether Multisite is suitable.