A publisher is the individual or company that owns a mobile app or website and makes its ad inventory available to advertisers. In mobile, publishers are typically the app developers and studios that monetize their audience. Whoever owns the surface where ads appear, and earns from it, is acting as the publisher.

What publishers do

Publishers build and distribute the app or site, grow an audience, and turn that attention into revenue by offering Ad Inventory and other monetization surfaces to advertisers. The role spans product, growth, and monetization: create something people use, bring users in, then earn from their engagement without driving them away.

How publishers monetize

• Advertising: banners, interstitials, and rewarded video.

• In-app purchases: currency, upgrades, and subscriptions.

• Offerwalls: rewarded, opt-in offers that monetize non-paying users.

Most publishers combine several of these, since each reaches a different slice of the audience. Ads earn from everyone, IAP captures spenders, and offerwalls monetize the free majority.

Direct sales, networks, and mediation

A publisher rarely sells every impression by hand. Most rely on ad networks and exchanges to fill inventory automatically, and many run a mediation layer that pits several demand sources against each other for each impression. The publisher's job is to assemble the right mix of demand, set the rules, and watch the results, so that each placement earns close to its true value. The more competition a publisher can create for its inventory, the higher its effective earnings, often tracked as eCPM.

Publisher vs. advertiser

A publisher sells access to an audience; an advertiser buys it. The publisher supplies the inventory and gets paid, the advertiser supplies the budget and the message. The same company can play both roles at once, buying users through User Acquisition while selling inventory to others, but on any given transaction one side is the publisher and the other the advertiser.

What makes a publisher's inventory valuable

Advertisers pay more for audiences that engage and convert, so a publisher's revenue tracks the quality of its users as much as their number. An engaged base with strong retention supports higher prices across every format, from banners to rewarded video. This is why growth and monetization are not separate jobs: the same work that keeps users coming back, good onboarding, fair ad load, and useful rewards, also raises what each impression is worth. Publishers who protect the experience usually out-earn those who chase short-term impressions.

Publishers and offerwalls

By integrating an offerwall, a publisher surfaces advertiser offers that users can complete for rewards, adding incremental revenue on top of existing streams. RevU partners with publishers to launch and optimize that offerwall so it earns as much as possible, matching offers to users and handling the demand side so the publisher can focus on the app.

Common misconceptions

• Publishers only run ads. Advertising is one lever; purchases and offerwalls are just as central to many businesses.

• A publisher must be a large company. A solo developer with one app is a publisher too.

• More ads always means more publisher revenue. Overloading users can raise churn and lower long-term earnings.