Blogs have become so famous in current times that a separate verb/adjective form of the word - 'blogging' has been developed. However, the term 'blog' had not been coined until the before '90s. Blogs however existed far before them. For a more detailed knowledge of blogs, let us go deep into the 'history of blogging'.
The word 'blog' although doesn't create sense comes from an definite source-'web log', meaning the records of the web. Fuse the two words together and you acquire weblog. The term 'blog' is a more augmented version of the word.