Q: What is meant by the decision "Revise your manuscript"?
What is the meaning of the journal's decision? The email says: Our decision is to revise your manuscript.
As the email from the journal quite clearly mentions, they have given you a "revise and resubmit" decision. You have to revise the paper as per the reviewers' comments and then resubmit the revised paper to the journal along with a point-by-point response to the reviewer comments. Once you have done that, your paper will probably be sent for another round of review and the final decision will be given based on the peer review report.