## Types We can convert types from one to another using something called casting. For example, let's say we had this: ```python year = "2025" ``` This is technically a string because it has quotes around it. If we got rid of the quotes, it would be a number, or an int. But, since it has quotes, it's a string. What if we tried to add 25 to this year number here? We can try this: ```python year + 25 ``` This will result in an error: ```bash TypeError: can only concatenate str (not "int") to str ``` Since 25 is an int, and year is a string, Python can't perform the addition. To fix this, we can typecast the year variable to an int: ```python year_as_int = int(year) ``` Now, we can add 25 to the year variable: ```python year_as_int + 25 ``` This will result in 2050. We can also convert the result back into a string using the `str()` function: ```python year_string = str(year_as_int + 25) ``` Now, we can print the string: ```python print(year_string + " is 25 years after 2025") ``` This will print the string: ```bash 2050 is 25 years after 2025 ``` This is how we can convert types in Python using casting.