A buffet: a self-service meal where diners serve themselves from a variety of dishes (often synonymous with 'Viking' in Japan).
ホテルの朝食はビュッフェ形式で、和洋いろいろ食べられる。
The hotel's breakfast is a buffet, and you can eat various Japanese and Western dishes.
週末は家族でビュッフェに行ってデザートをたくさん食べた。
On the weekend the family went to a buffet and ate a lot of desserts.
ビュッフェは好きな量を取れるので、子ども連れに人気がある。
Buffets are popular with families because you can take any amount you like.