it seems quite by definition that ISP are what it's about though
the principle that internet service providers should enable access to all content and applications regardless of the source, and without favoring or blocking particular products or websites. -Oxford Dictionary
Net neutrality is the principle that an ISP has to provide access to all sites, content, and applications at the same speed, under the same conditions, without blocking or giving preference to any content. -Wikipedia
Network neutrality—the idea that Internet service providers (ISPs) should treat all data that travels over their networks fairly, without improper discrimination in favor of particular apps, sites or services - EFF
Net neutrality, principle that Internet service providers (ISPs) should not discriminate among providers of content. -Britannica