How do water wells form?

In the inner layer of the earth water will be there which is called as ground water. when we dig a well we form a opening for the water to be explosed. so these water is taken for home usage. In some areas when there is a natural way for the water to come through it forms a spring. when we find that a particular place has ground water in it, we drill the ground until we reach the water surface, so as creating a openeing for the water. this water is then taken out mostly using a pump for usage in home, hotels etc.. when it rains the rain water goes through ground and it reaches the ground water. that is the reason the water level in the well raises usually during rainy season.