Answer:
A home equity is the total value of your home, having discounted all debts the house owns.
This value may increase depending on the economy of a country, the demand that exists, any remodeling or arrangement that the owner makes in his house, etc.
It can also decrease if the economy of a country is bad or has little demand, or the house is damaged, mortgaged, etc.
If your house is mortgaged and you would like to sell it, then the home equity will be less than if it were not.