Question

What is the green house effect​

Answer 1

Answer:

Greenhouse effect, a warming of Earth's surface and troposphere (the lowest layer of the atmosphere) caused by the presence of water vapour, carbon dioxide, methane, and certain other gases in the air. Of those gases, known as greenhouse gases, water vapour has the largest effect.

Answer 2

When heat is trapped by Carbon Dioxide $CO _{2}$

on the earth (which is a green house gas) , which causes global warming. This phenomena is know as global warming.

This was the answer in simple words.

Now I will give you answer from google.

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. Radiatively active gases in a planet's atmosphere radiate energy in all directions.