They are similar, but a diary is usually more personal, something you write to express your thoughts and feelings. A log is not as personal, it just records information, like you might keep a log of how many calories you eat per day or how many minutes you exercise, or hours you study.

Diary:a daily written record of (usually personal) experiences and observations . A log is usually used for ships and planes and work place ;nothing personal

A log is something you sit on when you have a picnic.

Definitions of log:noun a segment of the trunk of a tree when stripped of branches the exponent required to produce a given number a written record of messages sent or received Example: an email log a written record of events on a voyage (of a ship or plane) Definitions of Diary: noun a daily written record of (usually personal) experiences and observations a personal journal (as a physical object

Diary it is a daily written record of (usually personal) experiences and observations. While log it's a written record of messages sent or received. cowboy...