Explanation:

A blog (short for 'weblog') is a discussion or informational website published on the World Wide Web, consisting of discrete, often informal diary-style text entries. Blogs are frequently used to provide specialized information, opinions, or news in a particular field or niche, often updated regularly. Option (1) 'Website' is too general. Option (3) 'Web directory' lists websites but doesn't provide information itself. Option (4) 'Corporate Website' focuses on a company's information, not a general field.