Language always concerns with words furthermore its vocabulary. One of the ways to enrich vocabulary is learning morphology which studies about word formation and the part of morphological process is derivational suffixes. This research is aimed to describe types of derivational suffixes and word formation in derivational suffixes. It is categorized into descriptive qualitative research where the researcher describes in the sentences without using statistical calculation. All words used by Steve Jobs when he delivered his speech are the data source while words which containing derivational suffixes is the data. Instruments of the research are the researcher herself and the text of Steve Jobs’ speech. To analyze the data, it uses Miles and Huberman’s theory (1994: 10) said those are data reduction, data display, and conclusion. The findings result was gained 74 derivational suffixes consists of four types of derivational suffixes, noun, verbal, adjective, and adverb suffixes and also explains its word formation. Finally, derivational suffixes is necessary to learn and to apply by breaking the word into its elements foot and suffixes because of knowing these elements, we can build the words by themselves. It can increase our self-confidence and avoid lack of vocabulary.