Thomas Jefferson once elegantly stated that some truths we can hold to be self-evident. In electronics design, one of these truths is this: Nature isn’t digital, and as such, analog signals will always be used to measure real-world data.
While digital chips calculate via the binary system of ones and zeros, our real world doesn’t consist of ones and zeroes, but rather temperatures, pressures, velocities, etc. Analog deals with continuous signals. As an engineer, you will need to design analog circuits to process real-life voltages and currents.