What is global registration in components?

The components which are globally registered can be used in the template of any root Vue instance (new Vue) created after registration.

In the global registration, the components created using Vue.component as below,

Vue.component('my-component-name', {
// ... options ...
})

Let's take multiple components which are globally registered in the vue instance,

Vue.component('component-a', { /* ... */ })
Vue.component('component-b', { /* ... */ })
Vue.component('component-c', { /* ... */ })

new Vue({ el: '#app' })

The above components can be used in the vue instance,

<component-a></component-a>
<component-b></component-b>
<component-c></component-c>

Remember that the components can be used in subcomponents as well.