Sequence in a computer language means that programming statements are set out one after another. Unless the CPU is told otherwise, it will carry out each instruction in turn.
Therefore a 'sequential language' such as Python or 'C' sets out source code instructions one after another.
In pseudocode, each instruction is set out like this
Do this Next do this Then do this ....
More formally, it may look more like this:-
x ← 3 MyVariable ← 34 New_Variable ← x + MyVariable
Usually the order of a sequence is important. For example the pseudocode below cannot work because New_Variable is trying to use MyVariable and x before they are given a value
New_Variable ← x + MyVariable x ← 3 MyVariable ← 34
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: What is sequencing?