What is the difference between double and float in the C language?

In C language, both double and float are floating-point data types, but they differ in precision and memory usage.

1. Precision: The double data type has higher precision, allowing storage of a wider range and more accurate values. It typically has 15 significant digits, while the float data type usually has 7 significant digits.
2. The memory size: The memory space occupied by a double type is twice that of a float type. On most computers, a float type occupies 4 bytes, while a double type occupies 8 bytes.

Given the higher precision and larger range of double data type, it is usually preferred for calculations requiring higher precision or dealing with larger numbers. On the other hand, float data type can be chosen to reduce memory usage in cases where memory is limited or precision is not a top priority.