Jetpack is a free WordPress plugin that simplifies managing your sites. This single plugin enables Photon (a global CDN for images), uptime monitoring, brute force protection, traffic-boosting tools, single sign-on, multiple-site management, and automatic or bulk plugin updates. Additionally Jetpack includes several features that help you customize the look and feel of your site without installing other tools.
JetPack is strategically designed to help you in collecting valuable information and automatically growing your site traffic. In terms of security, JetPack has taken a huge leap and is providing many prime services like social sharing, protection, site verification, automation. Apart from these, JetPack comes with more than 200 themes, unlimited CDN, multiple SEO tools, unlimited storage, real-time backup system, etc.
Jetpack provides the essential security tools you need to keep your entire site backed up, instantly restore or migrate it, keep it free from malware and spam, and get priority support from WordPress experts just when you need it.
More information can be found at jetpack.com.