The ToastContainer component is the central piece that makes Toastify notifications visible in your React app. When you use Toastify, you must include a single ToastContainer somewhere in your component tree—typically near the root of your application. This component acts as the mounting point for all toast messages. Without it, even if you trigger notifications in your code, nothing will appear on the screen. The ToastContainer listens for toast events and renders each notification according to your settings.

Placement of notifications is a key aspect of the user experience. The ToastContainer allows you to control where notifications appear on the screen by setting its position prop. This prop accepts several values, letting you choose the most suitable location for your app. The most common placement options include "top-right", "top-left", "top-center", "bottom-right", "bottom-left", and "bottom-center". By default, notifications appear in the "top-right" position, but you can easily change this by passing a different value to the position prop when rendering the ToastContainer. This flexibility ensures that your toasts do not interfere with important UI elements and match your application's layout.