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Sequential access is a method of accessing data in a file where the system reads or writes information in a continuous manner, from the beginning to the end. This means that in order to access a specific data item, the system has to pass through all the previous data items in the file.

Random access, also known as direct access, is a method of accessing data in a file where the system can directly read or write information to any location in the file. This means that the system can access a specific data item without having to pass through any other data items in the file. It is an efficient way of accessing data when a large file is being stored.

There are several key differences between sequential access and random access: 1. Order of Access: In sequential access, data is read or written in a linear, continuous manner from the beginning to the end, while in random access, data can be directly read or written to any location in the file. 2. Speed: Sequential access can be slower than random access, as it may require passing through multiple data items before reaching the desired one. In contrast, random access enables faster access to a specific data item. 3. Use Cases: Sequential access is suitable for situations where most data items in the file will be accessed, such as reading an entire file, while random access is better when individual data items need to be accessed frequently or in no particular order, such as searching a large database. 4. Storage Devices: Sequential access is commonly used in data storage devices like magnetic tapes and some older hard drives, whereas random access is used in devices like solid-state drives (SSD) and RAM.