Best website for upload and share video for free

In present world, Showing your creative skill is necessary. For this, Everyone want a platform where they can share their creative video. There are several platforms are available in Internet like YouTube, Vimeo etc. In these platform when they upload any video, all the user of internet can access their video. [...]

Define the term polling. Why it is required?

Polling, or polled operation, in computer science, refers to actively sampling the status of an external device by a client program as a synchronous activity. Polling is most often used in terms of input/output (I/O), and is also referred to as polled I/O or software-drivenI/O. [...]