Amalgamation refers to the joining of one or more companies into a new entity. None of the combining companies remains; a completely new legal entity is formed.
Bootstrap Effect or Bootstrap Earnings Effect refers to the short-term boost in the earnings of the acquirer company when it merges with the target company even though there is no economic benefit from such combination.
Backward integraton is when a company acquires a target that produces the raw material or the ancillaries which are used by the acquirer. It intends to ensure an uninterrupted supply of high-quality raw materials at a fair price.
Forward integration is when a company acquires a target that either makes use of its products to manufacture finished goods or is a retail outlet for its products.