A Will can be used to pass your property the way you want, rather than the way your state’s statutes direct. This can avoid such disasters as having your assets pass directly to children too young or inexperienced to handle finances, or even worse, if you and your spouse both die then the Court might appoint outsiders as Guardians for your minor children and for their inherited property.
“Probate” occurs when a person dies leaving a Will. Then your named Executor petitions the Court to admit the Will to Probate so that he/she can transfer your property according to your Will. If you die without a valid Will then someone with legal authority must petition the Court to be appointed the Administrator of your Estate. So a Will gives you control over these and other matters.
If your Will is not properly prepared and executed with the legally required formality, the Will may be invalid.