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Please excuse my ignorance, but I really don't understand this concept. <br />
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I have been to 100's of sites and most of the sites I access show me an option to log in with the details I registered my account with, but also have a log in with Facebook or Twitter option. &nbsp;<br />
<br />
I have never actually ever logged into any of these using Facebook or Twitter because I don't know why I would want to. I am considering learning how to do this but am also asking myself why I would want to do this and what is the benefit?<br />
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If someone could please explain it to me I would be most grateful. I know I can just ask Google but a lot of times Google gives me way too much info and can end up being more confusing that informative. <br />
<br />
Thanks
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Please excuse my ignorance, but I really don't understand this concept. 

I have been to 100's of sites and most of the sites I access show me an option to log in with the details I registered my account with, but also have a log in with Facebook or Twitter option.  

I have never actually ever logged into any of these using Facebook or Twitter because I don't know why I would want to. I am considering learning how to do this but am also asking myself why I would want to do this and what is the benefit?

If someone could please explain it to me I would be most grateful. I know I can just ask Google but a lot of times Google gives me way too much info and can end up being more confusing that informative. 

Thanks

Logging into a website with Facebook/Twitter/Google etc.

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A social networking service is a platform to build social networks or relations among people who share similar interests, activities, backgrounds or real-life connections. A social network service consists of a representation of each user (often a profile), his or her social links, and a variety of additional services such as career services. Social network sites are web-based services that allow individuals to create a public profile, create a list of users with whom to share connections, and view and cross the connections within the system. Social networking sites allow users to share ideas, pictures, posts, activities, events, and interests with people in their network. Other popular services include Google+, LinkedIn, Instagram, Reddit, Pinterest, Vine and Tumblr.

Social Networking

Web applications are systems that run in browsers that perform functions normally associated with other client-based programs. One of the most commonly used web applications is email; instead of downloading individual emails to a local machine, the data is shown through a website. Other examples of web applications are collaborative systems like a wiki or an online game.