PDFs that are binned such as template PDFs or convert from and to unbinned PDFs.

zfit.pdf.HistogramPDF(data[, extended, ...])	Binned PDF resembling a histogram.
zfit.pdf.BinwiseScaleModifier(pdf[, ...])	Modifier that scales each bin separately of the pdf.
zfit.pdf.BinnedFromUnbinnedPDF(pdf, space, *)	Create a binned pdf from an unbinned pdf binning in space.
zfit.pdf.SplineMorphingPDF(alpha, hists, *)	Morphing a set of histograms with a spline interpolation.
zfit.pdf.BinnedSumPDF(pdfs[, fracs, obs, ...])	Sum of binned PDFs.
zfit.pdf.SplinePDF(pdf[, order, obs, ...])	Spline interpolate a binned PDF in order to get a smooth, unbinned PDF.
zfit.pdf.UnbinnedFromBinnedPDF(pdf[, obs, ...])	Create a unbinned pdf from a binned pdf.