WWDC stands for the Worldwide Developers Conference, i.e. a conference organized with developers in mind. We already know that this year's edition of the conference organized by Apple will start on 7th of June. This information is officially confirmed by the organizers and the event will last until 11th of June.

As in the previous year, WWDC 2021 will be organized as an online event and participants will be able to take part in it completely for free. In addition to the possibilities of cooperation with Apple engineers, a very important part of the event will be the presentation of the upcoming versions of operating systems developed by Apple. In this case, we are talking about new versions of such systems as iOS, iPadOS, watchOS, macOS and tvOS.

source