有关本地数据库与基于服务的数据库的问题

I have a some questions about local and service-based databases: Does using a service-based database require the user to have SQL Server installed? If so, is there ANY way around it? Does a local database require the user to have SQL Server installed? What is the difference between a local database and a service-based database. (I am talking about the items in Visual Studio)I have a some questions about local and service