{eps2pdf} is a Ghostscript frontend for converting document formats from {eps} to {pdf}.
eps2pdf concerns the eps to pdf converter eps2pdf. The converter is a front end for GhostScript (ghostscript). The conversion works by reading the eps and modifying its boundingbox to yield a pdf of a size determined by the boundingbox (not the paper size). This is particularly useful when using pdf format for figures in for example pdfLaTeX.