HTML, JavaScript

Help needed to understand the source code...I visited the website bseindia.com some time ago and when i was checking for its coding i couldn't understand the action performed when you click on the buttons aligned horizontally at the top (About BSE, Markets, etc). The anchor have href attribute with value only "#". I could use something like that in my upcoming project so i would appreciate some help.please tell the use of empty "#" in anchor tags href does and if any other language like Server-side etc then please do tell me.
 
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