Confident = (adjective) showing confidence.

• We are confident of success.
• The class teacher made a confident prediction that Rahim would secure the first rank.
• She was a confident swimmer.
• I feel much more confident about using the web now.
• I am confident that I have chosen the right job.

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Confidant = (noun) A person to whom one tells one’s secrets or with whom one talks about personal matters.

• In prison the killer told his confidant, his roommate, about all the murders he had committed.
• The patient knows their doctor is a confidant who will never reveal the secrecy of their illness.
• As she feels her husband is her confidant, she tells everything to him.

Note:-  The feminine gender of confidant is confidante.(very rarely used and the pronunciation is the same).