Crowdsourcing is a way of engaging large group of people (crowd) for a common goal.
The common goal could be data collection, complex problem solving, etc.
Crowdsourcing has its pros and cons. They are:
1. Crowdsourcing is cost effective than hiring professionals to do a task.
2. Ideas are generated in huge quantities and quick
3. The data collected could be of poor quality
4. They can sometimes mislead you.