Which to use in App part or web part

Recently I have started working on SharePoint 2013 but sadly I find it very confusing specially App part and web part.
In app part gallery also we have doc library,lists and in web part gallery also, which to use.
As a developer seeing future job perspective I should choose which option developing app part or developing web part.
I basically work with On-premise version no option of cloud. Can i create app for my On-premise version and how any link.

Hello Zakir
App Part also known as Client Part is one of the three ways in which an app can be presented to an end user. An App Part provides a way to mount an app to SharePoint. It uses an Iframe html element inside a SharePoint page to display the contents of an app.
In App Parts, the UI and the app content is generated remotely with the app code running outside of the SharePoint server. This ensures complete isolation between the SharePoint surrounding interface and the embedded app. SharePoint automatically creates an
App Part in the Web Part gallery when an app is deployed to SharePoint site.
Web Part is a reusable component or a server side control that can be added inside a SharePoint page. Web Part code runs directly within the SharePoint server. There are several out-of-box Web Parts available in SharePoint and one can also build their
own custom Web Parts. Web Parts are editable, configurable and can even be connected to each other. Also, Web Parts can be utilized within an app.
Both App Parts and Web Parts are listed in the Web Part gallery from where they can be added in a page. From an end user's perspective, App Part is like a Web Part - both of them provides a way to add a piece of functionality to a page. However, there are primary
differences between them in how they are developed and deployed. In App Part, the app code runs outside of the SharePoint while Web Part code runs within SharePoint. So, poorly built apps does not impact SharePoint environment as in case with poorly built
Web Parts.
Please mark as answer, if the solution works for you

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Paul Stork SharePoint Server MVP
Principal Architect: Blue Chip Consulting Group
Blog: http://dontpapanic.com/blog
Twitter: Follow @pstork
Please remember to mark your question as "answered" if this solves your problem.

Approved App Does Not Show in the App Part Section.

Hi all,
I have successfully add an App from the SharePoint App Store to my SharePoint Site which was developed using SharePoint 2013. The added app was successfully Approved then when I try to add that app using the App Part to a web page I cannot Find it
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Could someone try to solve this matter?
Thanks,
Regards,
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Ok I found the solution from another thread & it is at the below!
Cannot Add
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Blog: http://dontpapanic.com/blog
Twitter: Follow @pstork
Please remember to mark your question as "answered" if this solves your problem.
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Which to use in App part or web part

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