What are ILDASM and Obfuscator in NET?

• ILDASM (Intermediate Language Disassembler)
  De-Compilation is the process of getting the source code from the assembly.
  ILDASM is a de-compiler provided by Microsoft.
  This ILDASM converts an assembly to instructions from which source code can be obtained.

Obfuscated code is source code or intermediate language that is very hard to read and understand.
An obfuscator is a medium of making a program difficult to understand.
The way the code runs remains unaffected although the obfuscator makes it harder to hack the code and hijack the program