I need to know the use of Mathematical Laplace functions in practical life.?

Laplace transforms are just one of many transforms you'll learn. As for the real world, it is unlikely that you'll have to do any transformations. Computers generally generate that for you, but don't take it for granted. Depending on how specialized your job is you might actually have some hand calculations to do, so it's worth learning.

My perception is that utilization of the Laplace transform is the most direct and effective way to solve differential equations in any branch of engineering. How and whether the Laplace transform relates to Laplace functions, which is the subject of your question, I cannot say. But I can say that the Laplace transform, as a method, will be of great value in addressing many problems in electrical engineering.

The Laplace transform can be used to solve tricky differential equations, and to predict the output of a control system with feedback.