All names in Arabic have to be either masculine or feminine. There is no neutral gender (it) in Arabic.
One of the most common feminine marker for human nouns is ـة/ة. For example: طالِب means student, but طالِبة means female student, زَوج means husband, زَوجة means wife.
For non-human nouns, most nouns with ة/ـة are feminine nouns and nouns with it are masculine nouns. For example: بَيت (house) is masculine, but غُرفة (room) is feminine, كُرسي (chair) is masculine, طاوِلة (table) is feminine.
All adjectives that describe feminine nouns usually take ة/ـة .