What is the specific meaning of the term "module" in app development? [closed]

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I am new at android app development and I want to participate an app development contest. For this I have to do a registration. Now I am facing a problem about a word “module”. I am confused what exactly module in app development is? These words are provided in my registration form.

Describe your app idea from top to bottom
Please describe your app idea from what modules might be required, how data will be managed, what interfaces might be needed etc. You can also host your file on dropbox , Google drive and provide us link of your file here.

What should I write now? Please help me. Sorry for bad English and Thanks in advance.

Answer 1

(1) In software, a module is a part of a program. Programs are composed of one or more independently developed modules that are not combined until the program is linked. A single module can contain one or several routines.

from here.

Basically if you are developing a program you need to separate it's parts by their functions. Let's say it is a post office: you need a module which process the incoming messages (classes for filtering, checking the stamp, etc), a computation module (classes deciding which district it's going or is it going to another post office, etc), and a delivering module (postmans to streets or cars to another post offices). These parts are complex but they have their well-defined job and they should work independently and only communicating thorough their well-defined interfaces.

Of course this example is very basic and unrealistic but I hope you get the point.