As networks grow more complex, ISPs need the ability to adapt infrastructure quickly without waiting on physical rebuilds. This session explores how programmable infrastructure allows operators to respond to changing conditions by reconfiguring network behavior, capacity, and physical assets through software-driven controls. The emphasis is on practical, reactive use cases that improve operational agility rather than fully autonomous systems. Panelists will discuss where programmability delivers immediate value, including responding to outages, shifting traffic patterns, and accommodating temporary demand changes. Attendees will leave with a clearer understanding of how software-defined approaches help providers build more flexible networks, grow without overbuilding, and compete by reacting faster than the market around them.