Text operators
Use text operators to combine two or more text items into one larger item, indicate text constants in a formula, format the results of a formula, or represent special characters in a formula.
This formula concatenates the first and last name separated by a space:
FirstName & " " & LastName
For example, Michelle Cannon.
Related topics 
About formulas
Identifying text constants and special characters in formulas
Adding a new line to the results of a formula
Adding comments to a formula
Using a reserved word or symbol for a field or table name