It should be a complete sentence (or two) with keywords relevant to the page and its contents. There is no one, single correct way to write a meta description. There are multiple ways to get the ...

While titles summarize a page using a few main keywords, the meta description should expand on it. Focus on writing something that connects with your client and drives them to click. For instance ...

This move can impact all Instagram and Facebook subscribers and the future of the global advertising industry.