God performed miracles in the desert in order to provide for the Hebrews guidance, protection and daily needs.
When the Hebrews had no food and water, they started complaining to Moses. God heard their complaint and provided them with food and water. The food was in the form of manna and quails. Manna were cake-like substances. Quails were a kind of birds. These kinds of food were collected just enough for a day without any more to keep for the following day. The daily collection was done for five days. On the sixth day they were collecting food for two days. This was because no collection was done on the seventh day, which was a Sabbath. The Sabbath was to be kept holy. The Hebrews relied on these types of food for forty years. When the Hebrews complained about water, God told Moses to strike a rock with his staff. Water came out of the rock.
A miracle is an unnatural act or event caused by God.
The following were some of the miracles Jesus performed: