A single-threaded program is a program that can only perform one task at a time. In other words, it has a single sequence of instructions that are executed one after another. This means that the program can only handle one task at a time and cannot perform multiple tasks simultaneously.
While single-threaded programming has some limitations, it also has some advantages. Single-threaded programming is often simpler and easier to reason about than multi-threaded programming, which can be more complex and error-prone. Additionally, single-threaded programming can avoid issues such as race conditions and deadlocks, which can occur in multi-threaded environments.