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The caption Package

Documentation caption
Categories figures
Description

Customize the format of figure and table captions. You can either pass options to the class in a \usepackage[options]{caption} or you can set them anywhere in the document with \captionsetup{options}.

Options 
\usepackage{caption}
Examples

In the preamble:

\usepackage{caption}
\DeclareCaptionFont{quack}{\sffamily}
\captionsetup{
  font={quack,small},
  labelfont=bf,
  justification=raggedright,
  singlelinecheck=false,
  margin=10pt
}

In the document:

\begin{figure}[b!]
  \centering
  \includegraphics[width=0.5\textwidth]{sample}
  \caption{This is my lovely caption.}
  \label{fig:caption}
\end{figure}
\lipsum[1]