what is the difference between WHILE and WHENplease give in details!

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what is the difference between WHILE and WHENplease give in details!
what is the difference between WHILE and WHEN
please give in details!

what is the difference between WHILE and WHENplease give in details!
while 用 ing form
when 不需要
比方,
I saw John while I was riding on a bicycle
I saw John when I was in the park.