The best domain extension for a business website is generally considered to be .com. This is because it is the most widely-used and recognizable TLD, and is associated with professionalism and credibility. Additionally, .com domains are the most memorable and easy to type, which can be beneficial for businesses looking to establish a strong online presence.
However, there are other domain extensions that may be suitable for specific types of businesses. For example:
.biz: This TLD is intended for use by businesses and commercial websites.
.co: This TLD is intended to be used as an alternative to .com, and is often used by startups and smaller businesses.
.info: This TLD is intended to be used for informational websites, which may be well suited for businesses in service industry.
.net: This TLD is originally intended for network-related websites, but it is also used by a variety of other types of websites.
.org: This TLD is often used by non-profit organizations and educational institutions.
.store: This TLD is intended to be used by online store and e-commerce websites.
country-code TLDs (ccTLDs) such as .us, .uk, .ca, etc., is used by businesses operating in specific geographical regions.
In summary, while .com is the most widely-used and recognizable TLD and is considered the best domain extension for a business website, other TLDs such as .biz, .co, .info, .net, .org, .store and country-code TLDs can also be used depending on the type of business, target audience and the purpose of the website.
