A caption, also known as a cutline,

A caption, also known as a cutline, is text that appears
below an image. Most captions draw attention to
something in the image that is not obvious, such as its
relevance to the text. Captions can consist of a few words
of description, or several sentences.
Along with the title, the lead, and section headings,
captions are the most commonly read words in an article,
so they should be succinct and informative.

Hasil (Bahasa Indonesia) 2:

Sebuah keterangan, juga dikenal sebagai cutline, apakah teks yang muncul
di bawah gambar. Kebanyakan keterangan menarik perhatian
sesuatu di gambar yang tidak jelas, seperti yang
relevansinya dengan teks. Keterangan dapat terdiri dari beberapa kata
deskripsi, atau beberapa kalimat.
Seiring dengan judul, memimpin, dan judul bagian,
keterangan yang paling sering membaca kata-kata dalam sebuah artikel,
jadi mereka harus ringkas dan informatif.