 जो अमने 3 different type of social networks discuss की उस में से one और जो history के लिए गर देखें तो telephone जो ता अब वो mobile phone की शकल में आगया smart phone आगया और कही तना के आप की आप पास phone आगया तो this is very important to discuss and understand. this is valid today as well. अगर आई से अपने जेक्तली तो नहीं तो नहीं आगया, but I think it's about 60-70 years, yes maybe 100 years. उरानी ये तेकनालोगी है तो phone की, but it's still valid and applicable as a very very strong social network. अज़े मैं आप आप आप आप आप आप आप आप आप आप आप आप आप आप आप आप आप के ये मुबाईल फोंगे ये जी आप आप आप आप आप आप आप आप आप के ये जो मुभाईल फोंगे नहीं जो जीस सम जैसे मैंने आप को इंट्रोडक्षन में भी बताई के जो और आप कर लैंड लाएन है नहीं आज कल के जमाने में, in today's world it is not just telephone. आप का इंटरनेड भी आप को इसके साथ इंटिगरेटीट है और आप का जो स्पैष्ली टीवी तीईन चीजों का पैखे जो नहीं मुसली आज कल के जमाने में अवेलवल है और ये आप आप लोकालिटीग क्यों के जितने बड़े आप के सर्विस प्रवाइडर्ज हैं, ये जो इंक तो इंटरनेड सर्विस प्रवाइडर्ज होते एक होते टैली कोम कमुनिकेषन के सर् इमना उब वर्त दे अप फर थे एक फुल सगर तो वग्षम कर इस नाहन्ने जो क्यों क्यों के जो मुबाल मेसशिजं आप यctica और वो आप बढी मेसज गो तीईज अदेते सर्व ये क्यों के लगके अप पास मृम मैसशीज होते देख करतें, अब अप वगषम के आप र� if you can access internet, it means you can access your email as well on your mobile phone and after that, all your different collaborative platforms, like Facebook whereupon you can access them as well so from this point of view, telephone is still, as I have shared with you that if this is 60-70 years ago, it was as valid as it was applicable maybe in that time it was only one, which is the point of distance communication even before TV, maybe it was only one or two things please do some research and find out but it is valid even after 7 or 8 or 10 decades so this is very important for you to understand as we have discussed in the beginning that the different entities are individuals, businesses, group of business if we look at the telephone case, so when I talked about the landline, the business organizations and the families this is still a must-have there is a landline at home whatever is their size, a small business or a big business they are still using landlines and the mobile phone is obviously with everyone so the different data you generate from that because there are two objectives one is to identify the network there are two basic units in a social network how is it connected or the first step is who are the two entities or who are the two nodes after that, how is it connected how do they exchange information how do they exchange information from the media and then so on and so forth and then we keep on digging and finding out more and more about whatever these people do the advantages of this, you all know you need to discuss them but one thing that is a fundamental change that your mobile phone is your camera your TV is your watch you can imagine a calculator so many gadgets or tools we used even tells you how many steps you have taken even temperature or blood pressure you can calculate the apps you have your smartphone has replaced almost you don't need a watch, a camera, a radio a separate TV so you can imagine how many phones the mobile is and even the landline phones you get a display where you can see the other person as well or you can share information where the different meetings are especially official there are many more platforms they are not part of our discussion but using telephone you use them using internet you use them the teleconferencing solutions they work on this telephone line and on internet so this is a very interesting area very very knowledgeable and practical