When someone is detained, they're just a person of interest wanted for questioning. When they're arrested, it's because they've actually been charged for something.
Its more complex than that. Arrest is fairly straightforward, but you can be arrested and released without charge (e.g. Peter Mandelson was).
Detaining is not something I really understanding, but from what I have read it is using restraint of some sort without arrest and not really something police seem to have any special powers to do (whereas their powers of arrest are greater than those of other people).
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When someone is detained, they're just a person of interest wanted for questioning. When they're arrested, it's because they've actually been charged for something.
In the U.S. you can be “detained” for days or weeks for having brown skin.
It’s called a Kavanaugh Stop. https://en.wikipedia.org/wiki/Kavanaugh_stop
Its more complex than that. Arrest is fairly straightforward, but you can be arrested and released without charge (e.g. Peter Mandelson was).
Detaining is not something I really understanding, but from what I have read it is using restraint of some sort without arrest and not really something police seem to have any special powers to do (whereas their powers of arrest are greater than those of other people).