Okay, so imagine you're at school and someone is being mean to you. You tell your friends and they want to help you feel better. They can't make the mean person stop, but they can do something nice. So they all wear pink clothes to show their support for you. That's kind of like what the Pink Chaddi Campaign was.
Some women in India were getting bullied and harassed by a group of men. The women couldn't make the men stop, but they wanted to do something to feel better and show that they were not afraid. So they started the Pink Chaddi Campaign.
They asked other women all over India to send them pink underwear (chaddi means underwear in India's language). They were going to collect all the underwear and send it to the men who were being mean to them. But, that was just a funny way to show that the women were not afraid and would not back down.
The campaign became really popular, and a lot of people participated. The women felt the love and support of their fellow sisters across the country, and the men who were being mean were embarrassed and ashamed. In the end, the women felt powerful and the men learned that their behavior was not acceptable.
So, the Pink Chaddi Campaign was like a big group of friends wearing pink clothes to show support for someone who was being bullied. It helped the women feel stronger and the men learn a lesson.