Occum's Razor is a rule of thumb of logical reasoning.
It urges people to go for the simplest solution, avoid making too many (unfounded) assumptions and not to build assumptions upon assumptions.
Example:
I go home and discover that my front door has been pried open. My brand new TV is missing. What is more plausible?
1) Someone stole my TV
2) Aliens from Mars borrowed my TV to study Earth's HD technology.
It urges people to go for the simplest solution, avoid making too many (unfounded) assumptions and not to build assumptions upon assumptions.
Example:
I go home and discover that my front door has been pried open. My brand new TV is missing. What is more plausible?
1) Someone stole my TV
2) Aliens from Mars borrowed my TV to study Earth's HD technology.