The sequence "123456" is a six-digit numerical string that is often used as a simple password. Due to its straightforward nature, it is considered weak and easily guessable, making it unsuitable for securing sensitive information. Many cybersecurity experts advise against using such common patterns for passwords. In various contexts, "123456" can also represent a basic counting sequence. It is often used in educational settings to teach children about numbers and counting. This sequence is one of the first that learners encounter when developing their numerical skills, laying the foundation for more complex mathematical concepts.