Format of these commonly seen website

I see a lot of website using this format.

Big picture on the top and 3 icons in the middle.

is this something from wordpress format?
(or what is this made of if not wordpress)
Why is this so popular and please tell me the benefit of using this format as well.

http://www.freee.co.jp/?referral=taxac&utm_campaign=taxac&utm_source=taxac

https://shopcurbside.com/index.html
Beach LoveCEOAsked:
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GaryCommented:
One is like a parallax theme (Wordpress) and the other is just a plain website
There is no common theme but the parallax themes tend to use 3 in a row, but there are millions of other websites who use a completely different look
Whatever works for your website.
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