The report spans almost a decade of UK government policy decisions between 2001 and 2009.
It covers the background to the decision to go to war, whether troops were properly prepared, how the conflict was conducted and what planning there was for its aftermath, a period in which there was intense sectarian violence.
The main points are:
Sir John Chilcot has outlined his findings on the UK's involvement in the 2003 Iraq War and the lessons to be learned from it.