Light text against darker backdrops in Mail, Safari Reader, Calendar, and more makes everything easier to read in low lighting conditions. Adobe Reader (formerly called Acrobat Reader) is available as a no-charge download from Adobe's web site, and allows the viewing and printing of PDF files. Several other PDF-editing programs allow some minimal editing and adding of features to documents, and come with other modules including a printer driver to create PDF files. Acrobat and Reader are a major components of the Adobe Engagement Platform, and are widely used as a way to present information with a fixed layout similar to a paper publication.