There is rapid growth in technologies, so there is growth in the risk associated with the technology. Ethical hacking helps to predict the various possible vulnerabilities well in advance and rectify them without incurring any kind of attack from outsiders.
To beat a hacker, you need to think like one!
As hacking involves creative thinking, vulnerabilities testing and security audits cannot ensur that the network is secure, to achieve this organization need to implement a defense -in-depth strategy by penetrating their networks to estimate vulnerabilities and expose them.
Ethical hacking is necessary because it allows countering of attacks from malicious hackers by anticipating methods they can use to break into a system.
Ethical hacking is a crucial component of risk assessment,auditing, counterfraud, best practices and good governance. It's used to identify risk and highlight the remedial actions, and also reduce information and communication technology (ICT) cost by resolving those vulnerabilities....
SKILLS OF AN ETHICAL HACKER....
Plateform knowledge: in depth knowledge of major operating system, such as Windows, Linux and UNIX .

Network knowledge: in depth knowledge of networking concepts technologies and related hardware and software .

Computer expert: should be a computer expert adept at technical domains.

Security knowledge: has knowledge of security areas and related issues .

Technical knowledge: has high technical knowledge to lunch the sophisticated attacks.

Penetration testing methodology

Information gathering , vulnerability analysis, external penetration, internal network penetration testing, router and switches penetration testing, firewall penetration testing, IDS penetration testing, wireless network, Denial of service penetration testing, password cracking, social engineering, source code penetration testing, web application testing, SQL injection, physical security, surveillance camera penetration testing, database penetration testing, VoIP testing, Cloud penetration testing, war dialing, email security testing, telecom and broadband testing, SAP penetration testing...
Technology is evolving at an unprecedented rate, as a result ethical hackers and pentester are needed ..
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Knowledge is wealth.