If you’re talking about people use who.

Anna is the woman who is wearing the black dress.
• The person who keeps leaving the lights on please try and remember to turn them off. CORRECT
• The person that keeps leaving the lights on please try and remember to turn them off. WRONG
Remember: Who for people.
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Remember: Who for people.
The man, who was giving the presentation, hadn’t cleaned his flash drive.
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Remember: Who for people.
The baby, who bit my finger, is called Charlie.
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Which or that?
That is used when important information is added. Which is used when the information added is not important. (1:45)Vocabulary Video Lesson: Cars
This vocabulary lesson will help you define banger, company car, estate, hatchback, saloon, convertible, limousine, people carrier, stretch limo and hearse. (8:00)