A “BLOG (OR "WEBLOG") IS A PERSONAL WEBSITE:
containing mostly news (“posts”).
in the form of a diary (most recent posts at the top of the page), with most of the posts also arranged in categories.
set up using a specially-designed interactive tool.
usually created and run by a single person, sometimes anonymously.
A BLOG’S POST:
are usually text (including external links), sometimes with pictures and, more and more often, sound and video.
can be commented on by visitors.
are archived on the blog and can been accessed there indefinitely.
SO A BLOG IS MUCH LIKE A "PERSONAL WEBPAGE, EXCEPT THAT IT:
is easier to set up and maintain and so much more active and more frequently updated.
encourages a more open and personal style and franker viewpoints.
greatly encourages discussion with visitors and other bloggers.
sets a standard worldwide format for blogs, involving similar methods (two or three-column layout, comments on posts and RSS (Really Simple Syndication) feed.