The concept of merger and acquisition covers a number of different situations. In all cases, it corresponds to the merger of at least two companies with converging interests. The purpose is to allow one company to take control of another.
There are many ways to achieve this.
For example, merger and acquisition transactions may or may not result in the pooling of assets and liabilities within a single entity as permitted by the merger and acquisition mechanism. This is not necessarily the case following an acquisition where the two companies, the acquiring and the acquired, may continue to exist separately beyond the new capital link between them.
Another example: While the transaction is most often carried out by mutual agreement for companies in good standing, for companies in difficulty it takes place in the context of legal proceedings through a judicial administrator and depends on a decision by the Commercial Court.