Apple announced it will hold its annual Worldwide Developer's Conference this June in San Francisco.

The five day conference will take place from June 6 to June 10 at San Francisco's Moscone West. Apple says that during the five-day event it will focus on its iOS and Mac OS operating systems with demos of new kinds of apps that developers can build using Apple's advanced frameworks.

At this year's conference we are going to unveil the future of iOS and Mac OS, said Philip Schiller, Apple's senior vice president of Worldwide Product Marketing. If you are an iOS or Mac OS X software developer, this is the event that you do not want to miss.

Apple says developers will get to watch more than 100 technical sessions presented by Apple engineers. They will get a chance to see how to create Mac OS X Lion applications as well as apps for iOS. In addition, developers will be able to bring code to the labs and work with code the more than 1,000 available Apple engineers.

The annual event, held by Apple since 1983, has become one of the industry's biggest spectacles. Last year, tickets for the event sold out within eight days of being made available despite a rise in prices. It was at this event last year that Apple unveiled the iPhone 4.

With CEO Steve Jobs on medical leave, it is uncertain if he will attend. In the past, Jobs has always kicked off the event with his Keynote address.