A raw is the untranslated original, the chapter as it ran in Japan. People read raws to keep up with a series the moment it releases, to read something that never got an English version, or to study the language from real material.
You do not need a piracy site. Plenty of raws are official, and many are free:
The extension works on whichever of these you are reading, it translates the page you are on.
Free, 200 translations a week. Add it to Chrome, open any manga, manhwa, or manhua page, and press T.
Install free for Chrome →It is the original, untranslated version of a comic, the same pages that were published in Japan, Korea, or China before any translation.
Official apps and stores carry plenty: Manga Plus and Comic Walker offer free official chapters, and BookWalker or Kindle Japan sell digital volumes. The extension translates whichever one you open.
No. Press T and the page is translated in place. If you want to learn as you go, Study mode adds furigana and a native voice.