In Simple Words
In traditional payment systems, there is usually an intermediary: a bank, payment company, or another organization that keeps accounts and approves transactions.
Bitcoin was designed differently.
Instead of relying on a central manager, it works through a network of computers that follow the same rules. This allows value to move directly through the Bitcoin network.
The basic idea was to create a form of digital money that could work without depending on a central organization, such as a bank or payment company.