What is nested pcr?

Some articles on pcr:

Polymerase Chain Reaction - Variations On The Basic PCR Technique
... Allele-specific PCR a diagnostic or cloning technique based on single-nucleotide polymorphisms (SNPs) (single-base differences in DNA) ... PCR amplification under stringent conditions is much less efficient in the presence of a mismatch between template and primer, so successful amplification with an SNP-specific primer ... Assembly PCR or Polymerase Cycling Assembly (PCA) artificial synthesis of long DNA sequences by performing PCR on a pool of long oligonucleotides with short overlapping segments ...

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