why do you only need to call "render" in the controller sometimes and not always?

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Question:why do you only need to call "render" in the controller sometimes and not always?

1..:format (that period is a concatenation period)

2.redirect_to " ... "

3.errors.add_to_base("there was an error")

4. if you're happy with the default template, you can omit "render"

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  1. why do you only need to call "render" in the controller sometimes and not always?
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