What's the difference between diary and journal? They seem like they could mean the same thing, but I'm probably wrong.
Diary and Journal are synonyms, but there is an important difference:
A diary is strictly a record of personal and daily experiences. Journal could mean a more general record or logbook but more importantly a technical journal, that is a scientific or industry-related publication/periodical.
Summary: Diary and Journal have the same specific meaning, but journal can have other meanings also.
I don't know where I heard this (and I even searched google for the source), but I hear people saying, "Girls keep diaries, boys keep journals." I think they both mean the same thing, but you normally wouldn't hear a boy say, "I'm going to write in my diary." They're more likely to say, "I keep a journal."
A diary is mainly used to write things you would like to remember - daily activities, how the day was spent, what was done, the daily routine and anything that needs to get done. A personal journal is a record of significant experiences. It is much more personal than a diary. It contains feelings, emotions, problems, and self-assurances and can be used to evaluate one’s life. For a journal, one does not just record one's experiences but also thoughts, feelings and reflections. Diary writing is a daily activity but one can write in a journal whenever there is a desire to write about significant experiences.
Someone asked for sources:
Oxford Advanced Learner’s Dictionary, 8th edition
1 a newspaper or magazine that deals with a particular subject or profession a scientific/trade journal e.g. the British Medical Journal
2 used in the title of some newspapers e.g. the Wall Street Journal
3 a written record of the things you do, see, etc. every day He kept a journal of his travels across Asia.
1 a book with spaces for each day of the year in which you can write down things you have to do in the future e.g. a desk diary I'll make a note of our next meeting in my diary.
2 a book in which you can write down the experiences you have each day, your private thoughts, etc e.g. Do you keep a diary (= write one regularly) ? The writer's letters and diaries are being published next year.
© Oxford University Press, 2010
I kept (summer) diaries and journals a teenager. One summer, I wrote "diary" about random events taking place every few days. A couple summers later, I wrote in journal form, "A Summer's Travels," covering only those portions of my summer that was spent traveling in Europe and Appalachia. The journal was more "topical."