An eradication is the act of removing something completely, so that there's no sign of it left.
Eradicate is often used when talking about getting rid of things like problems, diseases, or pests. For instance, a government might launch an effort to eradicate poverty in their country by providing education and job opportunities for people who are struggling financially. Doctors might work together to develop treatments that can help eradicate certain types of cancer. Farmers might use special methods to try and eradicate pests from their crops so they don't have to use as many pesticides. In each case, the goal is to completely eliminate a thing or situation, rather than just treating its symptoms or making it more manageable.
To pull up by the roots; to uproot.
