You will receive an executable file that you cannot alter, enhance, or maintain when you purchase software. However, if you purchase the source code, you are free to alter, adapt, and update the program as you see fit.This provides you with the benefit of being able to alter the program to better suit your intended application requirements. Additionally, since you can use the code exactly as it is or modify portions of it for use in other projects or apps, purchasing source code lowers development time and costs. Additionally, you can ensure that all of the updates and bug fixes in your programs are applied.