What is DAO DAO- Data Access object Data accessing interface Position between operation logic data Source effect: to abstract and encapsulate all access to the data source. The dao manages the connection with the data source to obtain and store dataWhat is DAO ? ⚫ DAO - Data Access Object ⚫ Data accessing interface ⚫ Position: between operation logic & data source ⚫ effect：to abstract and encapsulate all access to the data source. The DAO manages the connection with the data source to obtain and store data