A decimal number can be defined as a number whose whole number part and the fractional part is separated by a decimal point.

The dot in a decimal number is called a decimal point.

Explanation: For example, \$50.5\$.
Here, \$50\$ and \$5\$ are separated by a point. So, \$50.5\$ is a decimal number.

Decimals that have the same number of digits to the right of the decimal point are referred to as like decimals..

Explanation: For example, \$58.6\$ and \$49.8\$, in \$58.6\$ and \$49.8\$, there is only one decimal place after the decimal point, so \$58.6\$ and \$49.8\$ are like decimals.