die Mayonnaise
mayonnaise
A thick, creamy cold sauce made mainly from egg yolk, oil, and an acid such as vinegar or lemon juice.
Zu den Pommes frites isst er am liebsten Mayonnaise.
He likes mayonnaise best with French fries.

mayonnaise
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mayonnaise
A thick, creamy cold sauce made mainly from egg yolk, oil, and an acid such as vinegar or lemon juice.
Zu den Pommes frites isst er am liebsten Mayonnaise.
He likes mayonnaise best with French fries.

In spoken language and informal situations, 'Mayonnaise' (mayonnaise) is very often shortened to 'die Mayo' (mayo).
Eine Portion Pommes mit Ketchup und Mayo, bitte!
One portion of fries with ketchup and mayo, please!
As an uncountable ingredient, 'Mayonnaise' (mayonnaise) is often used without an article when talking about the substance in general. You ask: 'Möchtest du Mayonnaise?' (Would you like mayonnaise?)
Für den Kartoffelsalat brauchen wir noch Mayonnaise.
We still need mayonnaise for the potato salad.
In Germany, the combination of French fries with ketchup and mayonnaise is very popular. This order is often called 'Pommes rot-weiß' (fries red-white).
Am Imbiss bestelle ich immer eine Currywurst mit Pommes rot-weiß.
At the snack stand, I always order a currywurst with fries red-white.
mayo
'die Mayo' and 'die Mayonnaise' mean almost the same thing: a thick, cold sauce eaten, for example, with fries, sandwiches, or salad. The difference is mainly in style. 'Mayo' is the short, colloquial form and sounds very natural in everyday conversations. 'Mayonnaise' is the full form and is more likely to appear on packaging, in recipes, or when speaking more precisely and a bit more formally. They are easy to confuse because both refer to the same product. In practice: in everyday life, people often say 'Mayo'; in official or written texts, 'Mayonnaise' is more common.

Meine Nachbarin kauft im Supermarkt Mayonnaise für den Kartoffelsalat.
My neighbor is buying mayonnaise at the supermarket for the potato salad.
Zu den Pommes nehme ich heute nur ein bisschen Mayo.
With my fries today, I'll just have a little mayo.