The World Wide Developers Conference keynote address, likely led by CEO Tim Cook, is expected to cover the latest software announcements like OS X and iOS.
It's rumored the company might finally open up Siri to third-party developers, inspired by the success of Amazon's hit assistant-in-a-speaker Alexa.
This year, the keynote location has changed, moving to San Francisco's spacious Bill Graham Auditorium, and the stakes are higher.
It's been a rocky year for Apple (AAPL, Tech30). In April, it announced a decline in revenue for the first time in 13 years, driven largely by a drop in iPhone sales with no new standout product to pick up the slack.
Every June for the past decade, Apple has hosted its multi-day World Wide Developers Conference in San Francisco. As per tradition, the company kicks off the event with one of its tightly choreographed media shows, during which Apple's CEO and a few executives trot out on stage and announce the latest product news, interspersed with a few demos and slick videos.
Sometimes there are surprises, like a musical guest. Mostly it's a familiar stream of primarily male and white employees announcing the latest software updates. Apple traditionally unveils updates to its mobile operating system, iOS, at WWDC. Don't look for a new iPhone -- those announcements are typically separate.