What are nonspecific sequences?

Some articles on sequences, nonspecific sequences, nonspecific:

Polymerase Chain Reaction Optimization - Non-specific Priming
... These include repeat sequences in the DNA template, non-specific binding between primer and template, high or low G-C content in the template, or ... reaction is a method of polymerase chain reaction by which primers will avoid amplifying nonspecific sequences ... Nonspecific primer binding obscures polymerase chain reaction results, as the nonspecific sequences to which primers anneal in early steps of amplification will "swamp out" any specific sequences ...