Final answer:
The '.com' in a web address signifies that the website is a commercial or business entity. Other top-level domains like .edu, .gov, and .org represent educational institutions, government websites, and nonprofits respectively.
Step-by-step explanation:
In the web address www.microsoft.com, the .com is the top-level domain (TLD) meaning it indicates that the website is a commercial or business website. Different top-level domains have various meanings, such as .edu for educational institutions, .gov for government websites, and .org for nonprofit organizations. These top-level domain indicators can help internet users understand the nature of the website that they are visiting.