What is the difference between quality control(QC) and quality assurance(QA)?

First of all we should know what QC and QA is
 
Quality Control

IEEE define QC as:

A set of activities designed to evaluate the quality of developed or manufactured products.

Quality Assurance

IEEE define QA as:

A set of activities designed to evaluate the process by which products are developed or manufactured

QA

• QA is all about Process,
• It is Proactive approach
• It is Staff function, all team is involved
• It Prevents Defects from occurring

QC

• QC is related to Product only
• It is Reactive approach
• It is specific to Line Function
• QC is for to Find Defects

 Examples
QC Vs QA

QA

• Quality Audit is QA
• Defining Process is also QA
• Selection of tools it comes under QA
• Training is QA activity
• etc

QC

• Walkthrough is QC
• Testing is also QC
• Inspection is QC activity
• Checkpoint review also in QC