Applications quickly become complex, making bugs harder to identify and increasing build times, which necessitates using advanced debugging tools such as hot reloading, step-through debugging, and time travel debugging to streamline the process. Hot reloading allows developers to inject new versions of files at runtime without fully reloading the application, preserving the state and speeding up development, especially useful for UI tweaks. In contrast, step-through debugging lets developers suspend application execution to examine values and set breakpoints, while time travel debugging allows moving both backward and forward through the code, offering more flexibility to identify bugs by recording the session and enabling a retrospective examination of code paths. Time travel debugging can be facilitated using immutable data structures and pure functions, which ensure consistent function outputs for identical inputs without side effects, reminiscent of Redux's principles. Tools like Replay record runtime inputs to facilitate time travel debugging by replaying the program and allowing developers to efficiently trace and diagnose issues through backward and forward navigation across the codebase.