Since your body won't have any carbs to default to, with carbs being the body's typical go-to energy source, your body will be forced to enter a state of ketosis where it relies on fat as fuel.
This is how keto promotes continues fat burn in the body, which can mean that the keto diet helps you lose weight more quickly than other higher carb diets out there, because it has no choice but to do so.
While many people are successful in following the difficult low-to-no carb rule, it's important that you ensure you are getting good healthy fats from the right sources.
But, so long as you utilize healthy fats and limit unhealthy (processed and saturated) fats, you can likely find great benefits from the ketogenic diet.