in Angular 1.x we had this:

• Angular 1.0 - major version
• Angular 1.1 - major version (well, more a preview of Angular 1.2)
• Angular 1.2 - major version
• Angular 1.3 - major version (dropped IE8 support)
• Angular 1.4 - major version
• Angular 1.5 - major version

In “Angular 2”, you’re looking at this:

• Angular 2 - major version
• Angular 3 - major version
• Angular 4 - major version
• Angular 5 - major version
• Angular 6 - major version
• Angular 7 - major version