This website provides access to the complete set of known letters written by and to Charles Darwin. It publishes the transcripts alongside contextual notes and articles. The site contains reference to more than 2000 people who are either direct correspondents or individuals mentioned in the letters.
The site contains extensive notes and commentary, organized in multiple ways, with a focus on correspondent and topic. It also includes learning resources for all age groups from age 7 to university. It also contains audio and video resources on a wide variety of topics ranging from historical discussions of science and religion or Darwin and women to inside views of working in the archives and editing the letters.
The site grew out of the print project begun in 1974, which has, over the years produced 24 volumes (to date) and is expected to produce a total of 30 print volumes. The support of major institutions has made it possible for the project to maintain a consistent level of very high quality work by some of the best scholars in the field.