1
please;kindly;pray;I beg (of you)
写真をどうぞ見せて下さい。
Please show me your picture.
2
by all means;certainly;of course;(go) ahead;(feel) free (to);(you are) welcome (to);please (help yourself to)
when giving permission or accepting a request
「電話を使わせてもらってもいいですか」「ええ、どうぞ」
"Do you mind if I use your phone?" "No, please go ahead."
3
here you are
when handing something to someone
「塩を取って下さい」「はい、どうぞ」
"Pass me the salt, please." "Here you are."
4
to give