志 is a bound form (不成词语素) that cannot stand alone. It appears in compounds meaning 'record' or 'annals' (杂志 magazine, 县志 county annals) or 'to mark, remember' (志哀 to mourn, 志喜 to celebrate). It also combines with other morphemes to form words such as 志向 (aspiration) and 志愿 (volunteer). When you encounter 志 in a compound, it contributes one of these core senses.