Logarithms can be divided into two types:

• Common logarithms:
  Logarithms of the base 10 are called common logarithms.
  • log₁₀25
  • log₁₀10
  • log₁₀16
  
  
• Natural logarithms:
  Logarithms of the base eare called natural logarithms.
  • log_e10
  • log_e400
  • log_er