tmtc smmrztn s th prcss f shrtnng st f dt cmpttnlly, t crt sbst ( smmry) tht rprsnts th mst mprtnt r rlvnt nfrmtn wthn th rgnl cntnt. rtfcl ntllgnc lgrthms r cmmnly dvlpd nd mplyd t chv ths, spclzd fr dffrnt typs f dt.
Txt smmrztn s slly mplmntd by ntrl lngg prcssng mthds, dsgnd t lct th mst nfrmtv sntncs n gvn dcmnt. n th thr hnd, vsl cntnt cn b smmrzd sng cmptr vsn lgrthms. mg smmrztn s th sbjct f ngng rsrch; xstng pprchs typclly ttmpt t dsply th mst rprsnttv mgs frm gvn mg cllctn, r gnrt vd tht nly nclds th mst mprtnt cntnt frm th ntr cllctn. Vd smmrztn lgrthms dntfy nd xtrct frm th rgnl vd cntnt th mst mprtnt frms (ky-frms), nd/r th mst mprtnt vd sgmnts (ky-shts), nrmlly n tmprlly rdrd fshn. Vd smmrs smply rtn crflly slctd sbst f th rgnl vd frms nd, thrfr, r nt dntcl t th tpt f vd synpss lgrthms, whr nw vd frms r bng synthszd bsd n th rgnl vd cntnt.