What does Deodexed mean?

[ckazaz]

Hi. I was reading the changes Xiaomi EU does to the roms and I saw "Deodexed" mentioned in the changelog.
What is the difference between Odex and Deodex? Why did you choose to Deodex roms?

 

[Igor Eisberg]

odex = optimized dex, so deodex means to remove the odex artifacts.
Must be done because the system apps cannot be modified if they are odexed.