Why we use # (Hashtag) in Social Media Post?

Iss video mai maine hashtag aur twitter trending ke bare me explain kiya hai, ye video dkhne ke bad aap bhi hash tag use karne lagenge.
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[@AskAlmostAnything]

Aap kis topic ko hashtag karna pasand karenge?

[@MySmartSolution]

nice info sir aap hamesha kuchh new sikhate hai....but videos pe utna view nhi aata...but mai aaspke sab videos dekhta hu sir...no issue sir...keep it up ...lage rhiye....kyoki bulding jaldi ban jati hai lekin mahal banane me samay lagta hai...ALL THE BEST !!

[@AskAlmostAnything]

My Smart Solution thank you dost

[@xraheelhoney5155]

sir i love your videos i m very thankfull to you for knowledge us about small and important things