Error: The deviation from the required logic, syntax or 
standards/ethics is called as error.

There are three types of error. They are:

 

Syntax error (This is due to deviation from the syntax of 
the language what supposed to follow). 
Logical error(This is due to deviation from the logic of 
the program what supposed to follow) 
Execution error (This is generally happens when you are 
executing the same program, that time you get it.) 
 

Defect/Bugs: Thou these two words are used extensively in 
the industry, but they carries the same meaning. Just the 
one is the synonym of the other. 

 

It can be defined as the effect because of the error which 
lies in the program.

 
Any more updates please send the answer.

Error:   same as above answer

Defect: When an error found by the test engineer(testing 
department) then it is called defect

Bug: if the defect is agreed by the developer then it 
converts into bug, which has to fix by the developer or 
post poned to next version.

Error:  means same as above answer.

Bug:   When the organization sees an error during the 
development, when the product is within the company.

Defect:  When an error is found after the product is 
delivered to the customer.

BUG/DEFECT/ERROR :-

.Software is said to have BUG if it features deviates from     specifications.

.Software is said to have DEFECT if it has unwanted side effects.

.Software is said to have ERROR if it gives incorrect out put.