stackexchange is the best community that checks and prevents plagiarism. Flag the content that you found as a copy and the moderators will look into it. The meta stackexchange clearly answered this question. You can find it here.
I was also found for the same guilt previous month and let me share the content mail I received after suspending my account for seven days:
"It has come to our attention that several of your answers consisted
primarily or entirely of text copied from other answers or websites.
We prefer not to simply copy content already available elsewhere in
lieu of creating something that adds value to this site specifically.
Whenever possible, we prefer that posts be your own original work, but
when a great answer already exists elsewhere, including a small
passage of text from another source can be a great way to support your
solution. But please note that we require full attribution with a link
to the original author, and please be sure you are not copying content
Thank you, and I look forward to your contributions in the future.
We have temporarily suspended your account; you may return after 7
So you can be happy that your contents have got enough respect and value in stack.