F-strings are the modern way to embed variables in strings. Put f before the quotes and use curly braces for variables:
name = "Alice"
age = 25
message = f"My name is {name} and I am {age} years old."
# "My name is Alice and I am 25 years old."
No type conversion needed. F-strings handle it automatically. {age} works even though age is an integer.
F-strings are cleaner than concatenation: compare f"Hello {name}" to "Hello " + name. The f-string is shorter and more readable.