The elements of the periodic table are arranged by increasing atomic number. These elements are then wrapped into rows and columns corresponding to the properties of the elements in each row and column.
Even cloud storage services like Dropbox and Google Drive can't replace the convenience of a quick email. But email poses problems, starting with the strict limits that many ISPs impose on the size of file sent or received. To get the file size down without losing important data, you zip it with compression software.
Software reliability is the probability that the software will work without failure for a specified period of time. Failure means the program in its functionality has no met user requirements in some way. Software reliability concerns itself with how well the software functions to meet the requirements of the customer.