Can you explain what is meant by synchronous input-output and its features?

Synchronous input/output (I/O) is a method of interacting with external resources (files, network, devices), where the program execution is paused until the operation completes. That is, when the program calls an input/output operation, it blocks and does not continue execution until it receives the result.

Features of synchronous input/output:

• Simple to implement and understand, as the code executes sequentially.
• Blocks the execution thread, which can lead to reduced performance, especially if the operation takes a long time (e.g., reading a large file or a network request).
• Suitable for simple scenarios or when delays are not critical.

Example of synchronous file reading in Python:

with open('file.txt', 'r') as f:
    data = f.read()  # execution is blocked until the file is read
print(data)