You have gas water heater.
Probably a tank-type gas water heater.
The plumber can fix water heater.
If you want to fix water heater yourself, then more information is needed to narrow down scope of answer.
1) Add a comment for possible help.
Instructions for lighting the water heater appear on front of water heater. Do those instructions include lighting the pilot light?
Will the pilot light stay lit?
On side of tank is a label. Label shows Brand, type (LP or NG), and model number.
This information can help narrow the type of gas control valve, and point direction for troubleshoot.
Add a comment with this information for possible help.
2) Do-it-yourself: Open following link for do-it-yourself resources to help solve gas water heater problems:
Generally the instructions show how to clean water heater parts, check venting, and show different types of gas controls, plus links for pilot light problems and cleaning air intake.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
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