Are you new to Protractor? Here's what you need to know

Protractor is known mostly for end 2 end testing, as an open source automation framework that was designed by Google for Angular JS applications.

Protractor is an end to end framework that tests your application just like a user would. You can build the tests around your tests cases. What happens if an user clicks a specific button? What is the next step? What happens if a user adds a negative value into a field? Is an error shown? Does it goes to the next step ? If you have the tests cases, or the business logic in a document, you can write tests around that. The recommended way when coding end to end tests, is to write tests around the functionality.

Protractor it was released in July 2013 as a prototype for Angular JS testing framework. Later it evolved in what we currently know as protractor.

Protractor is a wrapper build around Selenium with webdriverio. 
It supports angular specific locators (for example repeaters id’s, ng-click, ng-if etc)
It supports PageObjects (Page objects represents an Object Pattern Design) — helps on writing more clean and readable code.
It can use the same Framework integration for unit and end to end tests.
It supports fast development (you do not need to use sleep or wait, because it communicates with Angular directly)
It is based on Angular’s concepts, therefore it’s quite easy to test your own code.

Basically, it’s a framework build with JavaScript bindings(you will still use selenium at the base) that communicates with Angular’s framework and knows when Angular has finished rendering the DOM. With Angular, mostly you do not need to set a specific wait time in order to wait for an element to be rendered.
Protractor (just like angular) works with promises and expects.
A promise in Protractor works just like a queue control. Of like a control flow if you will.

Source, and more: https://thisqa.com/2017/06/15/grunt-and-protractor-for-beginners/

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