What is the difference between the test and training data sets.As per blogs and papers I studied what I understood is we will have 100 % data set then that is divided into 2 sets(test data set is 30% & reaming 70% is training data set).I want to know more points and use of differentiating the 100% data set to test and training data sets. 
what is the difference between the training and testdata set?
machine learning;beginner