Deep conditioner or prewash conditioner

AbdullahAbdullah Member
edited August 6 in Hair
According to definition, Deep conditioner is meant to be applied to hair, stay for  a while like 20 minutes or higher and then rinsed or washed with shampoo. Ulprospector also says applying conditioner before shampoo has better effects than after shampoo.
https://knowledge.ulprospector.com/8959/pcc-hair-conditioner-formulations/

I have searched google for Deep conditioners specially from big brands but couldn't find any conditioner that says it should be applied before shampooing or it should stay in hair for more than 5 minutes. 
It is advised to apply after shampoo, leave for 1-5 minutes, then rinse. Both normal and deep conditioner.

My questions:
1. What is the difference between normal and deep conditioner? ( If above definition for deep conditioner is wrong.)
2. Why companies specially big companies don't make conditioners that should be applied to hair before shampoo or stay for longer time in hair?
3. Big brands suggest you apply conditioner after shampoo and rinse after 1-5 minutes. This is for both normal and deep conditioners. So what is the difference between them? 
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