SAN FRANCISCO — When Facebook bought WhatsApp for $19 billion in 2014, the messaging app had a clear focus. No ads, no games and no gimmicks.

For years, that is what WhatsApp’s 2 billion users around the world got.

Now that is set to change.

On Monday, WhatsApp said it would start showing ads inside its app for the first time. The promotions will appear only in an area of the app called Updates, which is used by around 1.5 billion people a day. WhatsApp will collect some data on users to target the ads, such as location and the device’s default language, but it will not touch the contents of messages or whom users speak with. The company also said it has no plans to place ads in chats and personal messages.

In-app ads are a significant change from WhatsApp’s original philosophy. Jan Koum and Brian Acton, who founded WhatsApp in 2009, were committed to building a simple and quick way for friends and family to communicate with end-to-end encryption, a method of keeping texts, photos, videos and phone calls inaccessible by third parties. Both left the company seven years ago.

Since then, Mark Zuckerberg, the CEO of Facebook, now Meta, has focused on WhatsApp’s growth and user privacy while melding the app into the company’s other products, including Instagram and Messenger. Putting ads into WhatsApp opens a lucrative opportunity for Meta, which has been spending billions on artificial intelligence and other pursuits, while potentially raising questions about privacy.

WhatsApp also said it was introducing paid monthly subscriptions for content creators, similar to offerings from competitors like X, YouTube and Twitch.