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The main idea behind a VoIP number is that it works over the internet rather than through traditional telephone infrastructure. In simple terms, your voice is converted into digital data and transmitted through IP networks instead of physical phone lines. I found a helpful explanation here https://www.mightycall.com/blog/voip-number/ which describes how these numbers can be used on different devices like laptops or smartphones and are not tied to a specific location. This flexibility makes them useful for remote work, international communication, and modern cloud-based phone systems.