1. The problem asks: What does it mean to express a number or expression in exponential form? 2. Expressing in exponential form means writing a number as a base raised to an exponent, like $a^b$, where $a$ is the base and $b$ is the exponent. 3. The exponent tells us how many times to multiply the base by itself. For example, $2^3$ means $2 \times 2 \times 2$. 4. This form is useful for simplifying multiplication of repeated factors and for working with powers and roots. 5. For example, the number 8 can be expressed in exponential form as $2^3$ because $2 \times 2 \times 2 = 8$. 6. Another example: $x^4$ means $x$ multiplied by itself 4 times: $x \times x \times x \times x$. 7. So, expressing in exponential form is a way to write repeated multiplication compactly and clearly.