WINZIP vs 7ZIP

I don't know i haven't used win zip for a long time. I know that the new versions of win zip offer a more good compression. But these days i am not concerning anymore in the compression of files and this moment i have installed win rar another archiving program. Good luck!

Winrar compresses upto 40% Ithink. But video files are not compressed to that much. Compression relies on the fact that the data is redundant, that till some extent it was generated following some rules, and that we can learn those rules, and thus predict accurately the data. A compressor can reduce the size of a file by deciding which data is more frequent and assigning it less bits than to less frequent data. Clearly compression has two parts: one guess which are the most frequent symbols, and other which outputs the "decision" of the first one. Using the right terminology we would say that the first is called a model and that predicts the probability of the source, it then makes a probability distribution. And that the second one is the coder and it makes and emits codes based on the probabilities assigned by the model. The closer that are the predictions made by the model to the data, the more compression we can achieve, because we'll assign less bits to most of the data. Immediately the two main questions of data compression arise: which rules should we follow to assign probabilities to the symbols? and given a probability distribution, which are the smallest codes that we can assign? Information theory is a science whose role is to answer these questions. As we'll see later the answer is a Markov model and the entropy respectively. check this link http://www.igeek.com/articles/Software/Compression.txt

i using 2 = winzip + Winrar

Winzip is the most used of program . But winrar is better . I dislike 7zip