In Excel 2016, 2013 and 2010 when the typed text is larger than the width of the cell the text entered will appear as single line of text. If you want to align this text to the width of the cell then you can use excel 2010 word-wrap feature. If you want to do the alignment for whole column then you can right click the selected column and select Format Cells from the menu list.
Navigate to Alignment tab in the Format Cells windows and tick the check box Wrap text under the Text Control section. Click OK to save the changes.
This would do a word wrap of the text entered as shown below
If you want to apply the word wrap only for the selected cell then you can also use the Keyboard combination.Take your cursor to end of the text entered and press Alt + Enter simultaneously.