The domain extension is the part of the URL that follows the domain name—for example, .com, .org, or .edu. You see domain extensions all the time and probably give them no thought. Domain extensions typically categorize websites by type.
The most common types are: .com, .org, .edu, .gov, .net
Each of these extensions gives people an idea of what type of business or organization you have.
Setup: This fee is for the initial setup of the hosting server, security configurations, and email accounts.
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Still confusing?