What is the term used to describe making a product always available?

The term used to describe making a product always available is "perpetual." This concept implies a continuous and unending availability, indicating that the product can be accessed at any time without limitations. In various contexts, including inventory management and digital services, a perpetual state ensures that items or services are consistently accessible without interruption.

The other options describe availability with nuances that do not fully capture the essence of being always available. "Permanent" suggests a long-lasting condition but does not emphasize the ongoing nature of availability. "Constant" implies being unchanging or steady but lacks the connotation of unrestricted access over time. "Unlimited" may evoke the idea of boundless availability, but it does not convey the sense of an enduring state. Thus, "perpetual" most accurately reflects the idea of continuous and unending availability, making it the right choice.