How does the interest rate impact stock markets?

Interest is known to most people for its impact on credit, but it also affects investments, directly or indirectly. Some yields, such as fixed income, perform inversely with credit because they benefit from high-interest rates.
The standard interest rate also impacts investments in variable income. Let’s understand how financial institutions calculate this rate and how does interest rate impact stock markets.
What is the interest rate?
The interest rate is an institution’s main eleme