Direct discrimination means that a behavior is directly targeted and has a dominant differential treatment effect on people with different gender, race, skin color, age and other non-self-selective characteristics
Indirect discrimination refers to a seemingly neutral behavior that does not target anyone, but actually results in differential treatment effect on people with different gender, race, skin color, age and other non-self-selective characteristics
An enterprise explicitly recruits only workers under the age of 40 on the grounds that its employees need to work overtime frequently and have high physical requirements.