To expand on Junta's comment; drm free, no internet connection required, no subscription fees, no electricity required, easier to search, easy to use "hands off", can be a tactile experience, easier to read in daylight, and easy marginalia..
No DRM, but you can't legally copy any portion of a paper book without permission. You only need the internet connection to download the book, not to read it. You don't need a subscription fee for an ebook. You only need electricity to charge a kindle and then it's good for over a month depending on usage. It's just as easy to use hands off, maybe easier, I don't have to worry about it flipping close and finding my place again. Ebooks are much easier to search than a paper book. It doesn't even have to be in the index, I can digitally search for any word or words throughout the book, or even library. E-ink is just as easy to read in daylight as a regular paper book.
Advantages of ebooks?
I can carry a library of tech manuals with me in my pocket. If they get lost, destroyed or stolen I can replace my books for free(I might have to pay the price for the new kindle, but some of my books cost more than a kindle, plus I have multiple kindle devices and a smartphone.) They don't fill an entire room of bookshelves. They don't get moldy. I can buy a new book any day or night and have it in my hands in minutes and it will be cheaper than a new hardcopy version of the book.
One advantage of the paperbooks is that you can get a used copy that is cheaper than the ebook copy. I have done this from Amazon, it's amazing what you can find and have sent to your house for cheap.