Hash or hashing is when information or a string of characters converts into another series of characters. Usually, this new string is minor. For a better understanding, suppose you have a particular image of a person, and only a few people have that image. You’re going to find people who own this image. There are several solutions for you.
One solution is to show this image to everyone, which is very time-consuming and lacks security because everyone can see your picture. Another try is to share the image on social networks to accelerate the process, but again, many people will see the image and may save it for themselves. So, what is the best solution?
The best solution is to hash the image with a Hash function and share its output (a string of characters). People use this output to compare their images. If the output was the same, it is clear that both individuals gave the same image as input to the function.
Hashing in blockchain means processing the data of a block through a mathematical function that results in a fixed-length output. Using a fixed-length output increases security because anyone trying to decrypt the Hash cannot tell how long or short the input is just by looking at the length of the output.
The Hash or hashing process is one of the most important parts of any blockchain because all nodes or miners struggle with it. Using the Hash function helps check and compare the information in the block and increases security.