Competition law combination

What is merger in competition law?
Almost all systems of competition law provide for control of mergers, to prevent companies from joining together to eliminate competition between them.
A merger could be a complete union of two or more companies, a more one-sided takeover or the transfer of parts of one firm to another..
What is the relation between competition policy and competition law?
Competition policy has two elements : ‡ Putting in place a set of Policies that enhance competition in local and national markets. ‡ A Law designed to prevent anti competitive business practices and unnecessary government intervention..
The MRTP Act primarily dealt with issues related to monopolies and restrictive trade practices, while the Competition Act is more comprehensive and deals with anti-competitive practices, abuse of dominant position, and regulation of mergers and acquisitions.

What is merger in competition law?