What is a homologous series of carbon compounds?

Homologous series refers to the series representing a family of compounds in increasing order having the same functional group, and the successive members differ by CH₂ unit or 14 mass unit: for example, the homologous series of alcohols are given below:-

Methanol (CH₃OH)

Ethanol (CH₃CH₂OH)

Propanol (CH₃CH₂CH₂OH)

Butanol (CH₃CH₂CH₂CH₂OH)