what is unimolecular elimination reaction through conjugate base?

The E1cB elimination reaction is a special type of elimination reaction in organic chemistry.The abbreviation stands for Elimination Unimolecular conjugate Base. This reaction mechanism explains the formation of alkenes from (mostly) alkyl halides through a carbanion intermediate given specified reaction conditions and specified substrates.The reaction takes place around a sp³ - sp³ carbon to carbon covalent bond with an ?-acidic hydrogen atom substituent and a ?-leaving group

A strong base abstracts the ? proton generating a carbanion. The electron pair then expels the leaving group and the double bond is formed.