Mechanic said I need links for my car, what are they?!

Okay, so I have a 2003 Ford Mustang that started making a pinging popping noise whenever I turned. I took it to the mechanic and he said that my struts and shocks are bad, I need a new power steering pump and I need my fluid flushed. Then he said something about links but I wasn't paying attention because I was overwhelmed with the costs of repairs. What are links? There's probably all different kinds and I don't know which one. I want my friend to do the job for me so that I can order the parts but what does he mean by new links?

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