What is a capability of Chatter Messenger?

I am Sakthivel Madesh, a certified Salesforce Developer & Administrator working on Salesforce Technology since 2011. I am currently working in IBM Austraila as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 10 Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.