What is the use of functions.php file in wordpress? [closed] - wordpress

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I am new in wordpress and I develop my custom themes but i don't know why functions.php file used in theme development of wordpress.Thanks in advance.

In case you missed it, you should always check the WordPress codex -- http://codex.wordpress.org/ You can find pretty much everything you need there.
As for your question: http://codex.wordpress.org/Theme_Development#Functions_File

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I am new to wordpress and i need to create a plugin using wordpress. Can you say defaultly how much files I need to create for a whole plugin and how it works? Can you with one example.. Advance thanks
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Images for reference.
This is in Wordpress site i'm working on. Not sure if there is something I can do with Javascript to convert that code into quotes.
I was able to add remove_filter( 'the_title', 'wptexturize' ); to the function.php, this fixed the problem.

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I use plugin UserPress for WordPress in my site with Advanced Custom Fields.
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I am learning wordpress by myself. I have a question about theme option for theme development project.
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When i try to edit the post or page in my admin,it shows me "Thank you for creating with WordPress. Version 3.4.2".
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I just deleted and replaced wp-admin folder of my wordpress folder.Then, everything went smooth.

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