Final answer:
Diners Club introduced the first credit card in 1950.
Step-by-step explanation:
The first company to introduce the first credit card in 1950 was Diners Club. Diners Club was founded by Frank McNamara and Ralph Schneider and it was initially intended for use in restaurants. Later, it expanded to be accepted at other establishments as well. The Diners Club card paved the way for the development of modern credit card systems.