Ans: A blog is referred as an information or discussion published on website or World Wide Web incorporating distinct entries called as posts. Basically, the blogs referred as everything thing where you can include others too.
It is more individual in contrast to article and press release.
It is also considered as very personal in subject to both style and comprised ideas and information and can be written in the way just like you may talk to your readers.
It is also called Web diary or Online Diary.
The articles are concerned with specific topic or event and are highly oriented towards an opinion instead of information. An article is supposed to be more oriented towards showing up opinions, views and idea. Generally, it is written by a third party or expert of any specific field.
Press Release is related with a specific action or event which can be republished by distinct medium of mass-media including other websites. It should be simple, short and professional. It conveys a clear message or information.