If you are reading this, then you have probably heard of the famous data structure and algorithm in Java. It is the question that pops up when taking a data-driven approach to software development. To put it simply, a data structure is any physical entity (usually an organized collection) that helps you efficiently access information. An algorithm is a specific method that helps solve a problem or perform an action. For example, adding numbers together is an algorithm; so is searching through an array of numbers. In this blog post, we will answer the most common questions about data structures and algorithm in Java: A Comprehensive Guide . However, keep in mind that there might be more questions than answers — so make sure to read on to the end!