Programming is a way of instructing the computer to do simple tasks like Adding 2 numbers, rounding off a number, etc. by using a simple set of instructions or perform complex ones like calculating simple interest, given principal, rate, and time, calculating the average return on a stock over the last 5 years, etc.
These instructions are written in programming languages like Python, C, C++, Java, etc. to make computers to understand and execute.
Also, watch this video on Programming: