Copy writing is the use of words and ideas to promote a person, business, opinion or idea. Although the word copy may be applied to any content intended for printing, Content writing on websites may include among its objectives the achievement of higher rankings in search engines. Search engines have now become much more sophisticated, so the fundamentals of solid copy writing are more important than ever...
Yes, it's always Good to use 100% unique content for your website or blog post, now a days after panda update people are more consider about unique content