Jesus, as predicted by the prophets of old, was born of a virgin. Mary engaged to be married had not known a man. It was a miracle. There is no explanation other than God made it happen by His will; by His Word. Interstingly, miracles are hard to grasp. Due to the mystery of miracles, some don't accept them. At the same time I have heard this word used casually. For example, "Oh my goodness! I found my pair of shoes on sale! It was a miracle those prices," or, "Miracle! My son did his homework and I did not have to remind him," or, "It was a miracle! I thought the Super Bowl was sold out and I got tickets at the last minute."
From what I can tell in the Word of God, whenever a miracle happened, someone got saved, set free, delivered or ministry was birthed; and God got all the Glory. They are also not planned out in advance and completely supernatural. Meaning, the total absence of the flesh and completely done by the LORD. Elizabeth, the mother of John the Baptist, was barren and old; yet the Lord on His Word to Zacharias made a miracle by opening her womb. Moses held up his rod and by the Lord, the Sea parted. Christ rose himself from the dead. Jonah was swallowed by a whale and lived to tell about it. Isaish was caught up into the throne room of God Almighty. All of these things took place without prior knowledge that it would happen to them, it was done on the agenda of the Most High God, it was unexplainable, supernatural, it was all about God and He got all the Glory.
God is a worker of miracles. My prayer is that you would be a witness to and receiver of a great work that He does for you or through you. If you need a miracle; money miraculously showing up in your mailbox, a mulitplication of food in your home as demonstrated by Christ, your womb opened, or your physical ailment healed, ask for one. God can do it. He is a miracle worker and with Him all things are possible. Believe God for an authentic miraculous move of His hand and then see His salvation.