A multisite network is a type of WordPress installation setup that allows you to manage multiple websites within a single administrative panel. The main WordPress core files are shared across all the websites within the network.
https://wordpress.org/documentation/article/create-a-network/
Widgets · WordPress Plugins
Get access to data on 1,511,136 websites WordPress Multisite Customers. We know of 1,015,408 live websites using WordPress Multisite and an additional 495,728 sites that used WordPress Multisite historically and 458,035 websites in the United States.
Get a list of 1,511,136 websites using WordPress Multisite which includes location information, hosting data, contact details, 1,015,408 currently live websites and an additional 811,899 domains that redirect to sites in this list. 495,728 sites that used this technology previouslyand 458,035 websites in the United States currently using WordPress Multisite.
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