What is the use of bootstrap.groovy?

Sometimes a situation occurs in which a particular task is to be carried out every time the application starts or stops.”bootstrap.groovy” is used for this particular situation. It is a simple plain groovy script which has two important closures: the “init” and “destroy” files. So, whenever the application starts or stops, these closures are called upon respectively. This “bootstrap.groovy” is present inside the grails-app/conf folder. It is used to define a code whenever the application performs any function.