What is the string theory ? Explain it to me clearly and concisely without too much technical terms.
String theory is a theoretical framework that tries to explain the nature of the universe by describing its most fundamental building blocks as tiny, one-dimensional strings. These strings are thought to vibrate at different frequencies, giving rise to different types of particles that make up the universe, such as electrons and quarks.

One of the key features of string theory is that it attempts to unify two seemingly incompatible theories of physics: general relativity and quantum mechanics. General relativity explains the behavior of large objects, such as planets and stars, while quantum mechanics explains the behavior of particles at the smallest scales. String theory attempts to reconcile these two theories by describing everything in terms of strings, which are both large enough to be described by general relativity and small enough to be described by quantum mechanics.

String theory also predicts the existence of extra dimensions beyond the three spatial dimensions (up-down, left-right, forward-backward) that we experience in our everyday lives. These extra dimensions are thought to be curled up or compactified, meaning they are too small for us to see or detect directly.

While string theory is a highly promising idea, it is still a work in progress and has yet to be fully proven. However, many physicists believe that it has the potential to provide a unified theory of everything that could explain all the fundamental forces and particles of the universe in a single framework.
I said concise and not technical. Please try and summarize and explain this much, much simpler