BOOT is an acronym for Build, Own, Operate, Transfer. It is an asset procurement method, typically used by governments, where:
A contractor or joint venture partner designs and builds the asset (i.e. delivers the output of a project).
The contractor then owns and operates the asset (e.g. a toll road, airport or power station) for a period of time at little or no cost to the government.
After the agreed period (typically measured in decades) the contractor transfers the asset to the government at a previously agreed or market price.
There are numerous variations on this funding theme which allow governments to invest in infrastructure without the up-front costs.