They will appear in only one part of the Meta-owned messaging service, it said. The move is potentially lucrative, while raising questions about user privacy.

WhatsApp, owned by Meta Platforms, will introduce ads in the app's Updates tab, used by 1.5 billion people daily. The ads aim to create a new revenue stream without altering the personal messaging experience.

While the app has long promised a privacy-first experience free from traditional ads, recent updates suggest that's changing, and changing fast.In a blog post published Monday, WhatsApp announced an expansion of its "Channels" discovery and business tools,