How does Twitter work?

[Paige]

Hi im new to Twitter and i have no idea on how it even works can someone help me with these questions?
What does it mean when people do # (hashtag) ?
What does it mean when people do @ (at) ?
If someone "follows" you what does it mean?
When you "follow" someone what does it mean?
If you wanted to say something to someone how do you do it? Like if i wanted to say something to Niall Horan how does he see it?
And please just tell me everything i need to know about Twitter.
Thanks!
My username is PaigeFunn1 and my name is Paige Funn

[Yuvi]

What Is Twitter And How Does It Work – Beginners Guide
I think most of you know what Twitter is, after all I’ve been writing posts about various Twitter tools and tricks . But still I get emails and some questionsin comments: “ What is Twitter and how does it work? ” Here’s quick beginners guide to Twitter so from now on, everyone knows what I am talking about. (Because there will be more posts about Twitter and Twitter tools in future).
Don’t be overwhelmed by Twitter. It’s easy, it’s fun and it’s free. But… What is it?
People all over are Twittering. WTF is Twitter anyway? Most heavy duty techies and electronic device users know this, but still, new to many people, is this quickly rising phenomenon called “ twittering ”, the verb that describes the use of the application called Twitter.
Twitter is a free social networking and micro-blogging service that has changed the way many people communicate. Twitter allows users to send “updates” (or “tweets”: text-based posts, up to 140 characters long) to Twitter website via short message service (e.g. on a cell phone), instant messaging, from their computer at home or work, or through a third-party application.
Some see this as a way to simply report their’status’ to friends, some use it to post interesting links, some use it as a savvy marketing tool and still there are countless ways to utilize this real time quick messaging application.
It’s very easy to do. You just sign up (free registration), pick a user name (your site or profile web page will be ‘http://twitter.com/yourname here’), and you can ‘design’ your Twitter home pageby uploading an image or choosing web colors.
Then what?
Well, you can search for other twitterers by using the search box or browse other Twitter users and choose to ‘follow’ their tweets if you wish (that’s all what Twitter is about – following others and getting others to follow you). Let me be your first friend on Twitter – Follow me . You can make your tweets private or public and even send messages direct to other twitterers, as opposed to publicly posting yours.
That’s all! Pretty simple I know… That should clarifyall your questions and dilemmas about how Twitter works.
Stay tuned – I will be writing more posts about Twitter, like how to use it to market your business or website, connect with like-minded people and many other creative uses of this cool service.
[tags]twitter, how twitter works, what is twitter, beginners guide, tweets, social media, social networking, online communities[/tags]

[Rostan]

Go to twitter help centre from the link below..You'll get all the answers..