what are cyber crimes ?

The Cambridge dictionary defines Cyber  Crimes as Crimes committed with the use of computers or relating to computers, especially through the internet. Universally, Cyber Crimes  is understood "an unlawful act where in the computer is either a tool or a target or both" . 
 

The Information Technology act deals with the following cyber crimes along with others: 

1.Tamparing with computer source documents: 

A person who knowingly or intentionally, conceals (hides or keep secrets), destroys (demolishhes or reduces) , alters (change in characteristics) or causes another source code used for a computer, computer program, computer system or computer network, when the computer source code is required to be kept or maintaible by law is punishable . for instance, hiding the C.D.Rom in which the source code files are stored, making  C file to CPP file or removing the read only attributes of a file.

2.Hacking:

Hacking is usually understood to be the unauthaurized access of a computer system and networks. Whoever with the intent to cause or knowing that he is likely to cause wrongful loss or damage to the public or any person destroys or deletes or alters any informaitions residing in a computer resource or diminishes its value or utility or affects it injuriously by means is said to commit hacking.

3.Publishing of information, which is obsense in electronic form:

A person who publishes or transmits or cause to be published in the electronics form, any material which is lascivious, or its effect is such as to tend to deprave and corrupt persons who are likely to read, see or hear the ,matter contained or emvodied in it, is liable to punishment. The important ingredients of such an offence are publishing (make genmerlly known or issue copies for sale to public), or transmitting (transfer or be a medium for), or causing to be published (to produced the effect of publishing), pornographic material in the electronic form.

4.Accessing protected system:

 Any unauthaurized person who secures access or attempts to secure access to protected system is liable to be punished with imprisonment and may also be liable to fine.