How many namespace are there in salesforce

Question

I know some name of salesforce provided namespace like System, Database, ApexClass, Messaging.

Can anybody give me the list of all Namespace in Salesforce?

Answer 1

There's a list of them in the Apex Developers Guide.

• ApexPages Namespace
• Approval Namespace
• Auth Namespace
• Canvas Namespace
• ChatterAnswers Namespace
• ConnectApi Namespace
• Database Namespace
• Dom Namespace
• Flow Namespace
• KbManagement Namespace
• Messaging Namespace
• Process Namespace
• QuickAction Namespace
• Reports Namespace
• Schema Namespace
• Site Namespace
• Support Namespace
• System Namespace