Keto is short for "ketosis", which is the process of your body burning fat for energy - producing ketones.
The keto diet consists of consuming roughly 80% of your calories from fat, 20% protein, and limiting carbs to below 50g.
In the absence of incoming carbohydrates, your body converts to using fat for energy, and with this comes a host of benefits - which can be reviewed in this medically reviewed article.
I've committed to keto for several months in the past and found great success. Once I adapted to the process (which entails feeling worse before you feel better - termed "keto flu") I had consistent and stable energy and a noticeable mental clarity.
Having said this, I always raise a few concerns with keto. For many people, it isn't a sustainable lifestyle. To remain in a state of ketosis you, obviously, have to consistently limit carbohydrates.
Social events and meals shared with people make this especially difficult. I found the best results when I was away from home working and could stay in my lane, but as soon as I returned to my day-to-day life I preferred my usual eating schedule.
It's also difficult to grab food on the go, as the world isn't catered to being keto. This isn't a reason to avoid it, as preparation is a simple fix - so be sure to do some research and planning.
The overlying point is that we are all biologically individual, so we react to high-carb and high-fat diets differently. What works for one person won't work for the next. So, the only way to find out if keto is for you is to dive in and see!