What is the difference between a journal and diary?

They pretty much are one and the same critter!

(although....I had not clue about the last entry of Journal! Machine part? wow!)

http://www.thefreedictionary.com/Journal

jour·nal
n.
1.
a. A personal record of occurrences, experiences, and reflections kept on a regular basis; a diary.
b. An official record of daily proceedings, as of a legislative body.
c. Nautical A ship's log.
2. Accounting
a. A daybook.
b. A book of original entry in a double-entry system, listing all transactions and indicating the accounts to which they belong.
3. A newspaper.
4. A periodical presenting articles on a particular subject: a medical journal.
5. The part of a machine shaft or axle supported by a bearing.

http://www.thefreedictionary.com/diary

di·a·ry
n. pl. di·a·ries
1. A daily record, especially a personal record of events, experiences, and observations; a journal.
2. A book for use in keeping a personal record, as of experiences.

A journal is meant to be read. A diary is private.

journals are for tracking progress(goals) and diaries are for remembering moments and thoughts.

I would thank that a man keep a journal and a woman keeps a diary.

Diary is more feminine

A Diary is something that you keep private events and emotions to process as you grow along life's road...!!!

A Journal, on the other hand, like a newspaper is something written that one would want to share with people...!!! Dream Journals and Travel Journals are examples of writings that one would want to eventually share...!!!

A journal is usually kept by businesses.

A diary is kept by a person and is personal.

No difference. Daily, personal writing is both diary, journal, daily log - whatever you want to call it. 'Diary' has a feminine connotation so I prefer 'journal' when teaching.