Text-align decides upon the horizontal aligning of text. This applies on any text in any containing block element (like a <div> or <p>, and also in table cells.

This box has the parameter text-align:left; which results (as we can see) in the text having the normal flow, aligning to the left side of the <div>
div{
text-align:left;
}
This box has the parameter text-align:right; which results (as we can see) in the text aligning to the left right of the <div>
div{
text-align:right;
}
This box has the parameter text-align:center; which results (as we can see) in the text being centered within <div>
div{
text-align:center;
}
This box has the parameter text-align:justify; which results (as we can see) in the text aligning to the left and the right of the <div>
div{
text-align:justify;
}