This guide is designed as a "get started" or introductory read for the starting to intermediate designer who wants to learn or get more knowledge about cross-DPI and cross-platform design from the very beginning.

Resolution independence is the notion that all graphics on a computer display should be zoomable to an arbitrary multiplier without losing quality. If you know even the slightest thing about computer graphics, you’ll understand that in a resolution independent world, bitmaps are out and vector graphics are in. Vector graphics can scale gracefully to an […]

We offer some advice for developers who are working with resolution independent applications.

[…] For the past few years, we have been anticipating the need for larger and larger graphics in user interfaces. This need is driven by displays with higher densities—in a few years time, our current 100 dpi displays will seem as quaint as a 640×480

Resolution Independent UI (Apple Developer)