Does Making HTML Code and CSS responsive is todays users demand?

One of the customer asks me that you need to have a responsiveness in your website so that users can open your website on any device.
I have searched on internet and also find out google and SERP also gives importance to the websites that are responsive in nature…
Could you tell me whether it will be helpful to me or not…
Please click here to view my website to give me appropriate solution.

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