Web site Vs Apps

I am in the process of designing  or having my own online shopping cart web site  . I have realized that without having web site  can do the same job with the Apps or tell me the different in the each case  .

is there any pre define  temple for online type web site to be build my self without going to web designer  or web designer can select the temple for me  ?

if the designer given design  can check the type of design he/she used  . example standard template or custom design   ?
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You have plenty to choose from: https://wappalyzer.com/categories/ecommerce
e.g. https://www.opencart.com/index.php?route=feature/competition
The job of web designer would be to create template to your needs/designs, not to copy/paste others work. Probably you can hire artist to develop graphical concept, then if you are lucky artist can do the template too.
There are great templates for shopping cart, depending of the web application and platform you plan to use.
curAuthor Commented:
this is one time purchase or rental basis  ? I hope this pictures and other thing are fully customizable
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For the themes:

You buy the item and get all updates and 5 month support.
I'm buying these since a few years and I'm very satisfied, the prices are low compare to the time you will save.
Take the time to read comments and rating.

Check creation date and minimum requirement.

For example Opencart v2 is the newest version so make sure you buy a theme that is compatible for this version.

So take the time to read to choose the theme that will fit your needs.

For the script you will have to install it (most are free opensource) on hosting server, they have Softaculos or Installatron package that can help you to install the application. Of course you will have monthly fees for hosting your store.
You should test the script prior to buy the theme ;)
curAuthor Commented:
HTML ,WordPress and magneto are design options? we  I hope I have to select only one of these /

after selecting one template . I can do the changes with my items photos

Yes this is the theme or template category related to specific script.

So first you have to decide which script meet your needs
so take the time to check demos
Opencart is an easy one to set.
Opencart demo:

Yes you will be able to add your own product image using the admin interface of the script.

So I encourage you to test the demo,

Depending of your knowledge and skills

The easy way
Install the script from your hosting panel using Softaculos or Installatron


you can install the script locally on your PC using wampserver
Download Opencart: http://www.opencart.com/?route=download/download

Then decide the script you want to use, then if the default theme doesn't fit your needs you can buy a premium theme.
But first you need to decide which script to use :)

Good luck
curAuthor Commented:
If I can do the above temp  study doing the  we design course
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curAuthor Commented:
what is the different between  App vs web site ?
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