LockerService For Lightning Components

At a high level, LockerService uses various technologies and techniques that are intended to do the following:

Prevent:

Components from causing XSS and similar security issues
Components from reading other component’s rendered data without any restrictions
Components from calling undocumented/private APIs

Enable:

Cool new features like client-side API versioning similar to REST API versioning*
Faster security review
Better and more secure JS development practices
Running 3rd party JS frameworks like React, Angular and so on*
Easily adding or removing new security features and policies

Check the below link for more information

https://developer.salesforce.com/blogs/developer-relations/2016/04/introducing-lockerservice-lightning-components.html

Cheers!!!

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