The plot shows the following signals:

1. Input signal $x(t)$ (first subplot): This function is non-zero between $t = 2$ and $t = 4$, following the form $t$ in that interval.
2. Impulse response $h(t)$ (second subplot): This function is non-zero between $t = 0$ and $t = 2$.
3. Output signal $y(t) = x(t) \ast h(t)$ (third subplot): The result of the convolution, which is the system's output.

The output $y(t)$ captures how the input signal is shaped by the system's impulse response.

Would you like more details or have any questions? Here are five related questions you might find useful:

1. How does the convolution operation work in general for LTI systems?
2. What are the properties of the unit step function $u(t)$?
3. How does the duration of the input affect the output in a convolution operation?
4. How would the system output change if the impulse response were a different shape?
5. What is the physical interpretation of an LTI system's impulse response?

Tip: The limits of integration in convolution depend on the intervals where both input and impulse response overlap. Understanding this can help simplify computations.