1. The problem is to simplify or understand the expression $t^2$. 2. The expression $t^2$ means $t$ multiplied by itself: $t \times t$. 3. This is a basic power rule where the exponent 2 indicates the number of times the base $t$ is used as a factor. 4. There is no further simplification unless a value for $t$ is given. 5. So, the expression $t^2$ is already in its simplest form. Final answer: $t^2$