Let's have a quick look at key highlights:

1. Native' apps for Watch

Apple Chief Executive Officer Tim Cook announced an update to the operating system for its Watch that should make apps for its latest gadget speedier and help untether it from the iPhone.

Cook said that so-called "native" apps will be coming for the Watch and was the biggest news in the early part of his address at an annual developers conference, but the company was expected to later announce details of a widely anticipated streaming music service.

2. El Capitan

Apple unveiled the next version of its operating system for Macs, El Capitan, continuing the company's theme of naming key updates to the software after California landmarks. OS X 10.11 El Capitan, named after a mountain within Yosemite national park, will be available as a free update in the autumn.

OS X El Capitan builds on the groundbreaking features and beautiful design introduced in OS X Yosemite, refining the experience and improving performance in lots of little ways that make a big difference.

3. iOS 9 with smarter Siri

New Delhi: Apple Inc has announced a new generation iOS 9 scheduled to be released later this year. iOS 9 will be available for update on all iPhones, iPads and iPods. iOS 9 is full of enhancements and adds new multitasking features to devices.

Siri can do more than ever, and new proactive suggestions help users get things done before they askThe operating system enhances performance, battery life, and security.

4. Apple Music

Apple unveiled a subscription streaming music service that could be a powerful rival to online services such as Spotify and Pandora. Apple Music, available to users of iPhones and iPads on June 30 in 100 countries, includes a radio station with personalized playlists and a choice from millions of songs on demand.

The service will be available for USD 9.99 per month, with a family plan for up to six people at USD 14.99.

5. New details about Apple Pay

Apple Inc listed new details about its Pay service, saying it was already supported by more than 2,500 banks and will surpass 1 million locations accepting it next month. In addition, the company said it would roll out the service to the United Kingdom next month.

In a related move, Apple said it would rename Passbook, its app for credit and debit cards and boarding passes, to Wallet. Apple will allow iPhones to be used to pay at 250,000 locations including London's transit system.