Googolplex vs. Googol — What's the Difference?

A googolplex is the number 10googol, or equivalently, 10(10100). Written out in ordinary decimal notation, it is 1 followed by 10100 zeroes; that is, a 1 followed by a googol zeroes.

A googol is the large number 10100. In decimal notation, it is written as the digit 1 followed by one hundred zeroes: 10,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000,​000.

The number 10 raised to the power googol, written out as the numeral 1 followed by 10100 zeros.

The number 10 raised to the power 100 (10100), written out as the numeral 1 followed by 100 zeros.

The number $10^\{10^\{100\}\}$ or $10^\backslash text\{googol\}$, ten to the power of a googol.

The number $10^\{100\}$, or ten to the power of a hundred. Equivalent to ten duotrigintillion (short scale), or ten sedecilliard (long scale).

(figuratively) A countable number

A cardinal number represented as 1 followed by 100 zeros (ten raised to the power of a hundred)

An infinitesimally small portion of land, defined for legal purposes.

A cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol)