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URL describes SAM
URL type Description
URL http://samtools.sourceforge.net/SAM1.pdf


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SAM (Sequence Alignment/Map) format is a generic format for storing large nucleotide sequence alignments. SAM aims to be a format that:

  • Is flexible enough to store all the alignment information generated by various alignment programs;
  • Is simple enough to be easily generated by alignment programs or converted from existing alignment formats;
  • Is compact in file size;
  • Allows most of operations on the alignment to work on a stream without loading the whole alignment into memory;
  • Allows the file to be indexed by genomic position to efficiently retrieve all reads aligning to a locus.