We generally use cat command to display the contents of a file.
If a file is very big then the contents of the file will not fit in screen, therefore screen will scroll forward and in the end we just see the last page of information from a file.
With more command we can pause the scrolling of data from a file in display. If we use cat command with more then we just see the first page of a file first. On pressing enter button, more command will keep changing the page. In this way it is easier to view information in a file.
When using the cat command to display file contents, large data that does not fit on the screen would scroll off without pausing, therefore making it difficult to view. On the other hand, using the more command is more appropriate in such case because it will display file contents one screen page at a time.