From the mail bag: What the heck does deodexed mean?

Clark writes,

What the heck does odex and deodex actually mean? I see the terms mentioned in almost every custom ROM thread and can't find an answer that I can understand. I'm hoping that Android Central can help out.

Awesome question, Clark. And one I think we can answer in terms that most folks will understand. As you've noted, you see the terms odex and deodexed in many forums posts about custom ROMs or assorted hacks for phones and tablets both. It takes a lot of work for developers to create deodexed ROMs from "stock" ROMs, like the ones offered from both OEMs and Google alike.

To begin, we need to know what an odex file is.  It's a part of an application (the .apk file) that has been prebuilt to make the Dalvik Virtual Machine load it faster using less resources. If you look in the /system/app/ folder on your Android phone or tablet, you'll see that just about every application has both an .apk file and an .odex file. These files work together through the Dalvik VM to make the apps run as they should on our devices. Let's break it all down after the break.

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Source: http://feedproxy.google.com/~r/androidcentral/~3/8W3nTvz6BKo/story01.htm

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