Welcome
Welcome to the Pprune Wannabee forum.
By the very nature of your question I am assuming that you are relatively new to the industry and to Pprune in particular.
Can I ask you to use the 'Search' function and spend some time reading through the articles on this forum? You will find that your questions have been asked and answered recently.
In the meantime I am closing this thread to stop more idiots (like the ones I have deleted) having fun at your expense.
HWB