There are also teachers who use these kinds of techniques to teach in a more animated manner. The idea is to keep children interested because without their attention, it is difficult to make them absorb what you are trying to teach.
There are many more worksheets available. They vary in complexity of the activity depending on the age and grade level of a child. At a young age, kids are first taught to write letters in print only. When kids reach the age of eight to ten, they are taught how to write in cursive. They may find this quite difficult and boring at first. But one fun way to teach them this is to use worksheets also.