Synthetic languages are languages that use a high degree of inflection to convey grammatical relationships. In these languages, a single word can express complex ideas through the addition of prefixes, suffixes, or changes in the word's form. For example, in Latin, a single word can indicate the subject, object, and tense through its various endings. These languages contrast with analytic languages, which rely more on word order and auxiliary words to express meaning. Russian and Hungarian are examples of synthetic languages, where the structure of words plays a crucial role in understanding their function within a sentence.