Yes, Swedish and Norwegian people can understand each other almost perfectly. Words differ in pronuciation and spelling but the grammatical structure of the language and the roots are nearly identical. For example Tack (Swedish) and Takk (norwegian). Both mean thank you, just diff. spelling. A very simple example, but it is accurate. Also: each language obviously has words that the other language does not, but this doesn't cause serious problems in communication. Oh yeah, and Denmark is sort of similar, but not quite.