Video editing is the technique of transforming a video into something which is dynamic and appealing to the eyes. The process contains appropriate arrangement, decoration, special effects addition, sound mixing, colour rectification, etc ..
which will make the video more communicative to the audience. It can be done live while on site or at the time of post-production of the video by using various tools which will convert the raw file into something which is better alluring to the targeted spectators.
Video editing is an important part of the final process of video making because there are a number of things while making a video which might not go so well. For instance in a wedding video an unwanted guest causing chaos or the sound of a child crying would not be something that the bride and bridegroom would like to share with the people who have not attended the ceremony or even those who have attended the function and want to go nostalgic. So a video editor is the person who has the last word in deciding what will make sense to the targeted viewers and what will not. So video editing training gives technical skills and knowledge about what to retain and what not to as well as how to beautify what is retained.