How Nested if works ? and what is the benefit of using it in codes - lets understand

Once upon a time, there was a sandwich-making robot named RoboChef. RoboChef's primary job was to make delicious sandwiches for hungry customers at a sandwich shop.
One day, RoboChef received a special order: a customized sandwich with various ingredients. To fulfill this order, RoboChef needed to follow specific instructions.
RoboChef began by checking the first instruction: "If the customer wants a vegetarian sandwich, use only vegetarian ingredients." This instruction acted like the first 'if statement'.
If the customer requested a vegetarian sandwich, RoboChef would follow the 'vegetarian' path. It would select ingredients like lettuce, tomatoes, and cheese—completely skipping the meat.
However, if the customer requested a non-vegetarian sandwich, RoboChef would follow a different path. It would then check another set of instructions within the initial 'if statement' - a 'nested if'. For instance, it might see, "If the customer wants turkey, include lettuce and add a slice of cheese."
Here's where the 'nested if statement' shines: within the larger decision of making a non-vegetarian sandwich, RoboChef can further refine its choices based on additional conditions.
RoboChef followed these 'if' conditions step by step, layering them like ingredients in a sandwich. Each 'if' statement corresponded to a different layer—deciding which ingredients to add based on various conditions.
The benefit of using nested 'if statements' for RoboChef was clear: it allowed for more precise and detailed decision-making. By checking multiple conditions in a structured manner, RoboChef could tailor the sandwich to exactly match the customer's preferences, ensuring a happy and satisfied customer with a perfectly crafted sandwich.
In a similar way, programmers use nested 'if statements' in their code to make complex decisions based on multiple conditions. These nested structures enable them to create more nuanced and customized behaviors in their programs, ensuring the desired outcomes in different scenarios.