Primary sources are first hand evidence or records of the time. They may take the form of diaries, letters, interviews, speeches, photographs, posters, pamphlets and official records.
They can give you a first-hand account of what life was like during the event or time you're looking at, and show you what people thought and felt about the world.
Secondary sources (eg. books and journal articles) discuss, interpret, analyse, summarise or criticise primary sources.
To find primary sources in Library Search, use the keywords for your assignment e.g. history, modern and then add "Sources".