In computer science, parsing is the process of analysing text to determine if it belongs to a specific language or not (i.e. is syntactically valid for that language's grammar). I'm developing an image processing project and I come across the word occlusion in many scientific papers, what do occlusions mean in the context of image processing? The dictionary is only giving a I have been trying to find a good definition , and get an understanding, of what a thread really is. It seems that I must be missing something obvious, but every time I read about what a thread is,... A space on your computer where extra downloaded video data is temporarily stored is the buffer. A video progress bar is probably the best visual example of this: That video is 5:05. Its total play time is represented by the white portion of the bar (which would be solid white if you had not started watching it yet.)